Hello @Antonio_Andre - welcome! And sorry to hear that you are having trouble with the browser extension.
That’s definitely not expected behaviour. Have you been able to confirm that the EXACT same username (email) and password won’t work in the extension, even though they will allow you to login to the Bitwarden web vault? You would be surprised at how many people discover that their email or password was just slightly off (e.g., missed a character in the email address or missed a capital in the password).
Here is what I suggest you try first: open Notepad and type in your email address and password (do not save). Then copy and paste those credentials into the web vault first to verify that they are correct. If successful, copy and paste the exact same text into the browser extension to see if that works.
If it works, you have found your problem. If not, something is misbehaving, so I would contact the Bitwarden CS team for help and explain what you did above: