Can't login to my account

why i can’t login to my account when i use a new pc? the system said “username or password incorrect.try again”

this is self-explanatory.

Which login screen, to your pc or Manager?

What version of Manager have you been using, desktop, cloud, or private server.

If this is cloud edition, you can reset your administrator password by going to https://cloud.manager.io then click Reset Administrator Password button.