I started to use the Brave web browser on Linux and installed the Bitwarden extension. However,despite entering correct credentials it denies me access (Error: username or password are incorrect). I verified this by copying the exact same credentials into the Bitwarden website to access my vault, and there they work.
This is because the EU servers were just made available (last month, I believe), so if you created your Bitwarden account before then, then it is hosted on the original servers in the US.