I recently added the Sendgrid add-on to my (free tier) Heroku app and now when I click on it on the add-ons page to open the dasdhboard, I get an error:
I tried opening it with
heroku addons:open as recommended at https://help.heroku.com/NQLJHM1C/not-authorized-errors-trying-to-log-into-an-add-ons-sso-using-dashboard and that doesn't work either.
Also, I see this in the logs when I try to send an email through Sendgrid from my Heroku app:
2020-03-15T18:09:24.297453+00:00 app[web.1]: [42e2afe7-65cb-48ef-b6b9-8d08302031bd] Net::SMTPAuthenticationError (535 Authentication failed: account disabled