Salesforce has announced that multi-factor authentication will become mandatory on February 1, 2022.
https://help.salesforce.com/articleView?id=000352937&type=1&mode=1
We’ll have to keep an eye on future announcements, but I think this may have an impact on AppSheet integration.
A possible case might be the phenomenon where app users cannot use the app until the App Creator clears the multi-factor authentication.
I’ll check how to deal with this, but I’ll share it here as well.