cannot verify server identity the identity of "apple.imap.mail.yahoo.com" cannot be verified

Tried to read other "threads" but everything was over my head to speak. I wish someone would explain what I need to do to get rid of this error message that comes up constantly. I just changed to iphone 11 pro. Been happening since this change. Running 13.3.1 software. Any help you could give in easy speak would be GREATLY appreciated!! Thank you so much in advance!!