I tried to reply to a student's IM message (they are in my course) and got the error "... only accepts messages from their contacts", even though I'd replied to their message previously. I added them to my contacts by following the instructions here (https://it.umn.edu/moodle-32-add-contact-your-moodle) but I'm still getting the same error. Any idea what's going on?
Possibly the student you are getting the error from needs to click on their name at the top right and select, Preferences. On the Preferences page, they need to select, Message preferences. On the resulting page, they need to REMOVE the checkmark in the the Prevent non-contacts from messaging me.
I'll check what their settings are, but the settings don't make sense as I was replying to their IM. Why should they be allowed to block someone to whom they'd sent a message from replying?