Username and Password Error Message

[ddwilliams1]

I keep receiving the below error, even when my credentials have been verified. How do I resolve this?

Run dawidd6/action-send-mail@v3
Error: Invalid login: 535-5.7.8 Username and Password not accepted. For more information, go to
535 5.7.8 https://support.google.com/mail/?p=BadCredentials af79cd13be357-794f3061475sm18893085a.74 - gsmtp