Forum Discussion
External sharing - forcing to sign in, instead of verification code
Recently i've migrated sharepoint site from one tenant to another. In the old one when someone shared a folder externally, the recepient was able to authenticate via verification code, that was sent ...
just noticed the "External users may be unable to access shared SharePoint Online folders or files" incident. Hope this is it.
Review also the differents in the external collaboration settings you might on each tenant
