A VBA project password may not be accepted for several reasons. You might be entering an incorrect password, using an old password, or the VBA project file may be corrupted. Sometimes, the keyboard language or Caps Lock can also cause this issue.
If you have forgotten your VBA project password and want to remove it, you can try SysTools VBA Password Remover. It is a third-party tool that can help remove VBA project passwords without manually editing the code.