Problem when re-logging in

When I try to login on a different device, it says “invalid username or password”. But I am sure that I got it right.
I even did a password reset but it was no good.
Am I doing something wrong here?
Has anyone else experienced this?
Could you fix this?

I think it is because your account detects a new IP address which might have been revoked by you ( ). Or a character in your username/password might have been wrong (maybe not caps or something similar).

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