Unable to login. Showing error id 0x8oocccof. Authentication failed. Does not accept my password although I was always loggedin

Authentication errors are not all Unsername and password errors, rerun your setup paying specific attention to your IMAP/SMTP or POP/SMTP settings, many providers sue a non standard port number for these services, also if using Gmail check to see that Pop/IMAP services have been enabled on the account this can be done in Gmail settings.