Google+ Page Manager Invite issue
I am trying to add someone to a Google+ business page that I own. I actually run the page for a business owner and the owner wants to reply to a Google review. He told me he received the invite to manage the page but that he "can't get past the password." I am not sure what the next step is. Does he have to use a gmail account to be a manager? I am not sure what to tell him.
Re: Google+ Page Manager Invite issue
If he got the invite from GMB he got it on a mail account (the mail account you specified).
He then should be able to sign in to his GoogleAccount based on the mail address (not necessarily a gmail based account) and then going to the busines page in question - it should show a link to accept the invite
Helmut Geissler, Google My Business Top Contributor | my G+ profile