below are the error I get when I try to publish the site.
Could not publish your page
We're sorry, we encountered an unexpected error. Please try again, if the problem persists please contact your Administrator.
When I hit save draft I get the below error
Could not save your changes
Could not save your changesREST error Error with code -2146232832, Microsoft.SharePoint.SPException due to Inner-Message: The specified user i:0#.f|*****|user@default*****.com could not be found. Exception-Message: [HTTP]:400 - [CorrelationId]:a616*****-x6e4-3*****-1e99-*****360743 [Version]:16.0.0.21625 at Error: Inner-Message: The specified user i:0#.f|m*****r@default******.com could not be found. Exception-Message:
in our environment we have a main domain "default*****.com" and a bunch of other UPNsuffix.com domains.
The main thing I noticed is "user@default*****.com truly doesn't exist in our environment. rather it is *** Email address is removed for privacy *** that does exist in our environment. For some reason, sharepoint online is mixing the pre windows authentication default*****\user with the different UPN Suffix we have for that domain.
[PII is masked by Mia Zhao MSFT Support]