This post mentioned that "if your machine is domain joined, you will notice your "Sync my settings" option is disabled for your MSA account. Thanks for submitting feedback regarding this! We've removed support for syncing of settings for MSA accounts on domain joined machines."
The two workarounds can be sumarized as below.
- Check the "Access work or school" page - if you have an Office365 account listed there, remove it.
- Change the registry - export this key: Computer\HKEY_USERS.DEFAULT\Software\Microsoft\IdentityCRL\StoredIdentities\xxxxxx.com (MS ID) from a machine that did not have the issue and import it into the registry on the problematic laptop.
Under the key on the working device, you will see the SID for the domain account and it will say "domain connected" for "account type". If you also had a local account associated under that key - just make sure you get the domain connected key listed as your account SID.
There are also several other ways to troubleshoot the "sycn settings greyed out" issue. Please check below link for reference.\
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
If the Answer is helpful, please click "Accept Answer" and upvote it.