Just an FYI, been multiboxing for months without issue on Win 10 using process explorer trick, but upgraded to Win11 today and can no longer use friends list joining like I’ve been able to. Tried restarting, exiting and going thru the motions again but no luck. Thinking of going back to Win 10 for now.
UPDATE: It seems to work from one account joining to another, but not in the other direction. Can make a game on Account 1 and join from Account 2, but I can’t make a game on Account 2 and join from Account 1. Never had this issue with Win 10.
Tried using the “invite” feature, but no luck and even tried removing and readding BNet friend, but still same result.
UPDATE 2: Tried opening D2R in a different order (Account 2 first then Account 1) and now it’s working from both directions. May have just been coincidence though and thinking it was something going on with Battle net, given another poster who isn’t multiboxing had same issue. Seems fixed for now.