Friendly brawl challenges with friends not working
When challenging a friend or my wife to a friendly brawl match with verified decks for the format, it either says unable to submit deck or simply says there is a network error. Until Ixalan, this had not been a problem. Then for whoever didn't have the error, they are unable to cancel the match and must use task manager to exit the game.

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Karaipantsu#15993 commented
Day four of upvoting every single one of these related threads until WOTC deals with this incredibly annoying issue. It's been going on for at least 3 months now, and doesn't seem to have any rhyme or reason as to who it effects and when. This has made our Arena playgroup extremely frustrated, and we'd all hoped the Khans release patch would fix it. Time to get this some more attention.
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Hyacinth#79808 commented
This is the exact issue we have on mobile too. I wish they were able to finally figure out how to reproduce this issue that's keeping them from bug fixing because I can't even play my friends at all anymore.