Hello. I have two RPi 1 B+ units loaded with Raspbian Linux 10 and BOINC 7.14.2. Neither are receiving work via Science United. Both are correctly connected as indicated by the --acct_mgr info command results below:

pi@RPi1BPlus02:~ $ boinccmd --acct_mgr info
Account manager info:
   Name: Science United
   URL: https://scienceunited.org/

I did quit and then join the account manager just to make sure of this. The results of a --get_state command are as follows:

pi@RPi1BPlus02:~ $ boinccmd --get_state
======== Projects ========
1) -----------
   name: Universe@Home
   master URL: https://universeathome.pl/universe/
   user_name: Donald Fisher
   team_name:
   resource share: 100.000000
   user_total_credit: 44451899.999976
   user_expavg_credit: 539079.918445
   host_total_credit: 0.000000
   host_expavg_credit: 0.000000
   nrpc_failures: 0
   master_fetch_failures: 0
   master fetch pending: no
   scheduler RPC pending: no
   trickle upload pending: no
   attached via Account Manager: yes
   ended: no
   suspended via GUI: no
   don't request more work: no
   disk usage: 0.000000
   last RPC: Tue May 12 15:26:57 2020

   project files downloaded: 0.000000
GUI URL:
   name: Message boards
   description: Correspond with other users on the Universe@Home message boards
   URL: https://universeathome.pl/universe/forum_index.php
GUI URL:
   name: Your account
   description: View your account information
   URL: https://universeathome.pl/universe/home.php
GUI URL:
   name: Your tasks
   description: View the last week or so of computational work
   URL: https://universeathome.pl/universe/results.php?userid=90655
   jobs succeeded: 0
   jobs failed: 185
   elapsed time: 0.000000
   cross-project ID: cb834fa89c57d627c929e502b0d02eca
2) -----------
   name: Asteroids@home
   master URL: http://asteroidsathome.net/boinc/
   user_name: Donald Fisher
   team_name:
   resource share: 100.000000
   user_total_credit: 413415840.000000
   user_expavg_credit: 6796096.235134
   host_total_credit: 960.000000
   host_expavg_credit: 28.539046
   nrpc_failures: 0
   master_fetch_failures: 0
   master fetch pending: no
   scheduler RPC pending: no
   trickle upload pending: no
   attached via Account Manager: yes
   ended: no
   suspended via GUI: no
   don't request more work: no
   disk usage: 0.000000
   last RPC: Tue May 12 15:32:21 2020

   project files downloaded: 0.000000
GUI URL:
   name: Your account
   description: View your account information and credit totals
   URL: http://asteroidsathome.net/boinc/home.php
GUI URL:
   name: Discussion forum
   description: View your account information and credit totals
   URL: http://asteroidsathome.net/boinc/forum_index.php
GUI URL:
   name: Scientific results
   description: View scientific results of the project
   URL: http://asteroidsathome.net/scientific_results.html
GUI URL:
   name: Donate to Asteroids@home
   description: Donate to Asteroids@home
   URL: http://asteroidsathome.net/boinc/donations.php
   jobs succeeded: 0
   jobs failed: 153
   elapsed time: 0.000000
   cross-project ID: 3d4ae6c95c54a9d7643bd190de6c35b1
3) -----------
   name: Einstein@Home
   master URL: http://einstein.phys.uwm.edu/
   user_name: Science United
   team_name:
   resource share: 100.000000
   user_total_credit: 1783253206.394400
   user_expavg_credit: 21408428.347847
   host_total_credit: 0.000000
   host_expavg_credit: 0.000000
   nrpc_failures: 0
   master_fetch_failures: 0
   master fetch pending: no
   scheduler RPC pending: no
   trickle upload pending: no
   attached via Account Manager: no
   ended: no
   suspended via GUI: no
   don't request more work: no
   disk usage: 0.000000
   last RPC: Tue May 12 09:30:48 2020

   project files downloaded: 1588678765.459677
GUI URL:
   name: Common questions
   description: Read the Einstein@Home Frequently Asked Question list
   URL: https://einsteinathome.org/faq
GUI URL:
   name: Screensaver info
   description: Read a detailed description of the Einstein@Home screensaver
   URL: https://einsteinathome.org/science/screensaver
GUI URL:
   name: Message boards
   description: Correspond with admins and other users on the Einstein@Home message boards
   URL: https://einsteinathome.org/community
GUI URL:
   name: Your messages
   description: Links to messages that you have posted on the Einstein@Home message boards.
   URL: https://einsteinathome.org/messages
GUI URL:
   name: Einstein status
   description: Current status of the Einstein@Home server
   URL: https://einsteinathome.org/server_status.php
GUI URL:
   name: Report problems
   description: A link to the Einstein@Home problems and bug reports message board
   URL: https://einsteinathome.org/community/forum/22
GUI URL:
   name: Your account
   description: View and modify your Einstein@Home account profile and preferences
   URL: https://einsteinathome.org/account/dashboard
GUI URL:
   name: Your results
   description: View your last week (or more) of computational results and work
   URL: https://einsteinathome.org/account/tasks/active
GUI URL:
   name: Your computers
   description: View a listing of all the computers on which you are running Einstein@Home
   URL: https://einsteinathome.org/account/computers/all
GUI URL:
   name: Host scheduler log
   description: View the Scheduler log for your computer 12825794 on Einstein@Home
   URL: https://einsteinathome.org/host/12825794/log
GUI URL:
   name: LIGO project
   description: The home page of the Laser Interferometer Gravitational-wave Observatory (LIGO) project
   URL: http://www.ligo.caltech.edu/
GUI URL:
   name: GEO600 project
   description: The home page of the GEO600 project
   URL: http://www.geo600.org
   jobs succeeded: 0
   jobs failed: 10
   elapsed time: 0.000000
   cross-project ID:
4) -----------
   name: SETI@home
   master URL: http://setiathome.berkeley.edu/
   user_name: Donald Fisher
   team_name:
   resource share: 100.000000
   user_total_credit: 10019226.258320
   user_expavg_credit: 305.872423
   host_total_credit: 2.172031
   host_expavg_credit: 0.056439
   nrpc_failures: 0
   master_fetch_failures: 0
   master fetch pending: no
   scheduler RPC pending: no
   trickle upload pending: no
   attached via Account Manager: no
   ended: no
   suspended via GUI: no
   don't request more work: no
   disk usage: 0.000000
   last RPC: Mon May 11 16:53:30 2020

   project files downloaded: 0.000000
GUI URL:
   name: Message boards
   description: Correspond with other users on the SETI@home message boards
   URL: http://setiathome.berkeley.edu/forum_index.php
GUI URL:
   name: Help
   description: Ask questions and report problems
   URL: http://setiathome.berkeley.edu/forum_help_desk.php
GUI URL:
   name: Account
   description: View your account information
   URL: http://setiathome.berkeley.edu/home.php
GUI URL:
   name: Preferences
   description: View and modify your computing preferences
   URL: http://setiathome.berkeley.edu/prefs.php?subset=global
GUI URL:
   name: Tasks
   description: View your recent tasks
   URL: http://setiathome.berkeley.edu/results.php?userid=954249
GUI URL:
   name: Computers
   description: View a list of the computers on which you are running SETI@Home
   URL: http://setiathome.berkeley.edu/hosts_user.php?userid=954249
GUI URL:
   name: Donate
   description: Donate to SETI@home
   URL: http://setiathome.berkeley.edu/sah_donate.php
   jobs succeeded: 0
   jobs failed: 0
   elapsed time: 0.000000
   cross-project ID: 292c5e1b583692947e350c815bd57d5d

======== Applications ========
1) -----------
   name: BHspin2
   Project: Universe@Home
2) -----------
   name: period_search
   Project: Asteroids@home
3) -----------
   name: einsteinbinary_BRP4
   Project: Einstein@Home

======== Application versions ========
1) -----------
   project: Universe@Home
   application: BHspin2
   platform: arm-unknown-linux-gnueabihf
   version: 0.19
   estimated GFLOPS: 0.15
   filename: BHspin2_19_arm-unknown-linux-gnueabihf
2) -----------
   project: Asteroids@home
   application: period_search
   platform: arm-unknown-linux-gnueabihf
   version: 102.13
   estimated GFLOPS: 3.88
   filename: period_search_10213_arm-unknown-linux-gnueabihf
3) -----------
   project: Einstein@Home
   application: einsteinbinary_BRP4
   platform: arm-unknown-linux-gnueabihf
   version: 1.06
   estimated GFLOPS: 0.34
   filename: einsteinbinary_BRP4_1.06_arm-unknown-linux-gnueabihf

======== Workunits ========

======== Tasks ========

======== Time stats ========
  now: 1589266982.520521
  on_frac: 0.999939
  connected_frac: -1.000000
  cpu_and_network_available_frac: 0.999781
  active_frac: 0.999781
  gpu_active_frac: 0.999781
  client_start_time: Tue May  5 15:24:30 2020

  previous_uptime: 180236.286279
  session_active_duration: 606967.198733
  session_gpu_active_duration: 606967.198733
  total_start_time: Wed Apr 15 18:50:24 2020

  total_duration: 2322604.086898
  total_active_duration: 2321770.135279
  total_gpu_active_duration: 2321770.135279

Both of these units used to get work, and nothing has changed as far as their configuration. Communication appears to be occurring since both devices are listed as computers in my profile.

I also have an RPi 3B loaded with Ubuntu 18.04.2 LTS and BOINC 7.17.0; this device is receiving work.

UPDATE: Both devices are now receiving work via Science United from World Community Grid; some projects seem to be no longer supporting the older ARM versions.