When using SendMaiI, I set the option to store a password when the dialog box appeared, but it appears that credential is not being accepted by the SMTP server. I haven't been able to find any documentation on how to change it. Using

MailSettings -> <|"Password" -> Automatic|>

did not cause the dialog box to reappear but it did give

Failure["SendMailFailure", 
Association[
 "MessageTemplate" :> MessageName[SendMail, "msgerr"], 
  "MessageParameters" -> Association[]]]

I went into my Wolfram Cloud account and I did see the Credentials file, but when I tried to delete it, it was immediately recreated.

How can I reset the password?