Same for about a year would drive me nuts! Changed email address from last working pc (not password) to use a different email. Wow I got confimation of email change email, and add trusted device email. So I downloaded teamviewer on my home server, and noticed it said login with user id, or email!.... so I tried user id/ password. It connected right away with no add device nag!!! Tried to change email back with no luck. no email at all. Actually it did not even change as it said it did. Add device emails still come to new address. At least it works.
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