Thanks, @neil, @codinghorror.
When we were invite-only, we had significant problems with login, with about 1/3 of the users unable to login the second time. I think it must have been users unable to login when they registered on one device but tried to login from another. At the time, forget password did not appear to work for any of them. We ended up systematically entering temp pwds in users accounts, emailing them the pwds and asking them to change them - very insecure MO.
We have hardly had any login trouble since moving to regular registration, but as a carry-over from the past we just assumed that forget-pwd was broken enough that it was not worth investing time into trying to get it to work. We will be more thorough from here on.
Is there a simple, Discourse-based way to give users who can’t login a way to contact the forum, that would land into a Discourse admin or mod thread? This would be really helpful to us, since our community is Discourse-only at this time.