I lost 3-4 hours on this issue and now I think I understand what happens.
Always when I use parts of the first name / last name in the password, I receive 500 HTTP error code.
Fix: Don't use first name / last name / email parts when you choose the password.
Avoid: First name: "Test", Last name: "User" with password "Test_123" or "User_123".
archemorus
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Slatina, Romania