Cannot login to webmail

Hi, I just created my server through digital ocean and connected cpanel. I believe I set everything up correctly but I am getting the following error when I try to login to webmail.

apparently it Seems dovecot cannot accept the provided password or username. Which i’m sure are both correct. please see email logs

I am not sure what to do next> I am wondering if someone can help me so I can solve this problem?

thank you


this is the email log