A few days ago I got this BOINC notification:

Rosetta@home: Notice from BOINC
This project is using an old URL. When convenient, remove the project, then add https://boinc.bakerlab.org/rosetta/
02/05/2020 17:29:03

Today I got this one:

Rosetta@home: Notice from BOINC
You are attached to this project twice. Please remove projects named Rosetta@home, then add https://boinc.bakerlab.org/rosetta/
04/05/2020 06:36:48

My client_state_prev.xml file says I'm connected to http://boinc.bakerlab.org/rosetta/ under my SU account and to https://boinc.bakerlab.org/rosetta/ under my Rosetta account.

Looks like the SU Rosetta URL needs to be updated centrally.

I'm getting the same old URL message as well, and concur with the idea that Science United's Rosetta URL needs to be updated centrally.

Hello,
The same thing happened to me a few days ago. I deleted the Rossetta project and put the new URL.

I do not know if having an account in Rossetta since 2009, tasks are also sent from SU. In SETI it had it since 2001, although the project is out of service now. I also have an account at Ibercivis since 2009, although I couldn't recover that one, since I deleted BOINC a few years ago and a few months ago I reinstalled it with my Rosseta, SETI accounts and created a new account with Ibercivis. Then I added SU.

Today the same message appeared to me as Rosseta but with GPUGRIP, this URL is old it changes to the new one. But of course, my GPUGRIP works under the SU account.

I do have my own account in projects such as SETI, Rosseta and Ibercivis. I suppose that from Science United you would have to update the new project addresses.
A greeting.