> It doesn't work with regular http auth so you have to copy the fields in manually then refresh.
There's a slightly easier way - escape out of the basic auth dialog box, open the 1password menu which will be showing you the website you're on and select 'Autofill', and then reload the page (ie Ctrl-R) and the basic auth is supplied from 1password.
Not great, but easier and faster than copying in username and password fields manually (and with keyboard shortcuts available to do each step it can be quite fast).
From 1password comments I believe the limitation is because Firefox does not allow 1password to interact with the auth dialog box (which isn't strictly a bad policy from a general security point of view).
More information may be available via the Microsoft admin portal, though users can't log in to see this because of the same prolem.
Quoting the status.office.com report:
Title: Error when attempting to access Microsoft 365 services
User Impact: Users may receive an error when attempting to access Microsoft 365 services.
More info: Users may the following error message: "AADSTS90033: A transient error has occurred. Please try again."
Current status: We're investigating a potential issue and checking for impact to your organization. We'll provide an update within 30 minutes.
Scope of impact: Users hosted in the Australia or New Zealand region may be affected by this event.