"Friend Challenge Exists" problem
Cannot issue a Friends Challenge due to erroneous "Friends Challenge Exists". Have tried exiting Arena and restarting it, have also flushed dns per the instructions here. Both me and my friend are getting the same "Friends Challenge Exists" screen, which cancels the new challenge.
Also tried issuing a Direct Challenge, but my friend never received the Challenge, and likewise his Direct Challenge to me was never received.

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SubionGreenscale#84785 commented
I have tried to challenge me friend a few times of late from after the latest update. It keeps saying we are not choosing compatible decks?! I have instructed my friend to also post from his end on it as well.
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Wicked Slink#35215 commented
Since CaptainChaos and I have never received a resolution or even a response from Wizards we have switched to Hearthstone and are recommending the same to our friends. Thanks.
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CaptainChaos#28356 commented
I guess Hearthstone will get my money from here on. Try it out!
https://www.blizzard.com/en-us/download/confirmation?product=hs&ref=playhearthstone -
Wicked Slink#35215 commented
I can't send a challenge to captainchaos either, it says it already exists. Thanks.