Hi folks!
We're always working to keep maximizing your security and productivity. We focus on solutions to make modernization as easy as possible. As customers work towards modernizing securit...
Updated Aug 31, 2022
Version 4.0
Blog Post
https://docs.microsoft.com/en-us/azure/active-directory/authentication/howto-mfaserver-deploy-upgrade for upgrading MFA server installations is to first upgrade the subordinates, because new versions are backwards compatible with older database versions from the master.
However, here it is recommended to upgrade the master only.
Those instructions look pretty contradictory to me, and I wouldn't want to end up in a situation where stuff breaks because the master database is incompatible with the subordinates.