Trying to accept an invite to an email address for a second time tells you some useless stuff:

The invite to Testo wasn't sent to your account

Sign in with a different account, ask for another invite, or add the e-mail address somebody@example.com to this account.

The important information is that this invite has expired, not that it was send to an email address that is not associated with your account (which is all that that text is actually trying to convey IIUC)