Ubuntu 21.04
This authentication error with Mailspring has become a daily issue vs. every few days.
No issues with other exchange enabled clients - currently falling back on to Bluemail since Mailsprings’ authentication link insists on taking you to Microsoft. Out Exchange is through goDaddy, so the hyperlink request produces an error. You have to add the exhange account in as an online account which is a pain to have to repeat these steps.