Did you try like a simple login email?
SimpleLogin email worked for me
Was a month or two ago tho. Maybe they are cracking down. If so I wonder why
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Same i signed up 2 months ago with alias email without any issues.
Ii guess they tightened their login process to prevent abuse or bots before their token airdrop.
I'm going to try signing up later today and I'll let you know how it goes!