Thanks.
Since this is happening on two different devices(Win and macOS) I believe we'll need to troubleshoot on each device separately as Sync is specific to profiles - profile data is synced but not the profiles themselves.
For macOS, since the "remove" option in profile settings isn't responding, I've only been able to come up with a brute-force solution. As I understand it, you'll need to remove profile data from two places.
First, go to the launch pad app > Open Keychain Access > Select login > All Items > Find and remove all com.microsoft.oneauth.**** items.
Next, Open the Launchpad > Open the Users folder and double-click on your user, so only those files are shown > Right-click in empty space below your files > Select "Show View Options" > Mark the check box "Show Libary Folder" > Open "Libary" folder > Open "Application Support" > "Microsoft Edge" > You should see several folders named Profile ** > Right-Click on each of these and Move to Trash. > Relauch MS Edge to test. Please let me know if you need clarification about any of these steps.
For Windows, Since you're running Win11 and it's in Beta there could be an issue there, I'm wondering if you're on the most recent build. To check, enter "Check for Updates" in the search box of the Windows taskbar > Check for updates