We have a contact who could successfully Sign In to our Power Pages portal. The user is a guest account in our Azure AD tenant.
We deactivated the contact record as a test -

After this, the user could not log in to the portal and instead got this message -

Now, we reactivated the Contact record and assumed that with this the user would again get access to the portal. But, for some reason the user still gets the above message. What am I missing?