Sorry for I cannot comment because my reputation is not enough.
I had the same problem, and when I opened profile card in VS2022's right top corner, it shows that the GitHub account "can't be used to roam settings across devices".
I found a relevant link about that: Add GitHub accounts to your keychain - Visual Studio (Windows) | Microsoft Learn
Not sure if the above can used to solve your question, but I changed to Microsoft account to start sync.