Não consigo acessar minha conta, mesmo colocando o usuário e senha corretamente… eu tenho eles salvos na máquina… por isso sei que está correto!
Please keep in mind this is an international forum. So please talk in English 
Are you hosting locally or in n8n cloud?
I also have the same problem. My N8N is installed on cloudron. On the PC it is logged in, however, on the notebook, I cannot log in.
You should be able to reset password if thats the issue?
n8n user-management:reset
in the terminal where n8n is installed.
Hope that helps.
Samuel