Invalid user name format

Invalid user name format

I registered my account in AppUp Beta with email "tuppe__619@hotmail.com", but it doesn't work with this new AppUp version, it says "Invalid user name format". It must be the underlines, I'm not able to create another account now with underlines. I tried to change my email in Dashboard for more appropriate one, but I can't log in AppUp software using this email. I've a submitted game in this account so it is quite important to recover this account.
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