First, you have to find out the exact reason. It can be like:
1. Incorrect PassWatch Account email address
2. Incorrect Master Password
3. Incorrect 6-digit code and Two-factor authenticator code
Next, if the above three options do not work, try using the password recovery options provided by the password manager. This might involve email verification or answering security questions to reset your master password. Ensure you're entering the correct credentials, and consider resetting your master password if needed. Keep your master password secure and avoid sharing it with others.