I set up one of my side project businesses as a Facebook business under a different email than the email attached to my personal Facebook account.
I want my personal Facebook account to own this Facebook business, so everything is under my personal (primary) Facebook account's control.
When inviting my primary Facebook account email to that Facebook business account, I received an email from Facebook to my primary account's email asking to confirm the invitation as expected.
I open the confirmation link in an incognito window, log in to Facebook using my personal Facebook account, pass the 2FA test, and click
accept invite, but receive the error:
The content you requested cannot be displayed at the moment. It may be temporarily unavailable, the link you clicked on may have expired or you may not have permission to view this page.
If I resend the invite, the same error occurs.