Blocked? Participants: You may not start a conversation with the following recipients: xxxxx ??

#1
I got the above message when trying to start a conversation with one other participant. The participant's name appeared in that message where the xxxxx is, above.

Have I been blocked by that user? Or is something else happening?

I clicked on the user's name from the list that appeared after I typed the first few characters of his name.
 
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