Same issue - can't play against friends. Absolutely wild that this isn't a bug that was fixed immediately.

they need to fix this already. Brawl hasn't worked on mobile for months. one of us will have to challenge from a laptop. now Brawl isn't working when we're both on desktop.

This is effecting me as well. I cannot play against my brother and we both just got into MTG together a few days ago :(

Same issue: impossible to play against a friend in the last THREE days!

We've experienced this problem not only after the update but from time to time the last few months. It's also been an issue while trying historic brawl. I would have thought that this issue would have been solved already with all the players experiencing this.

Same issue: impossible to play against a friend in the last THREE days!

It is absolutely ridiculous that this bug has been present for as long as it has. I want to test with friends for the upcoming RCQ season and it is literally impossible to do so on Arena.

Yea mine says unable to submit deck. Something along those lines.

Fix it quickly.
Otherwise give me money back.

I am experiecing the same issue. I can't play with my friends, Additionally I can't play Standard either.

Please fix this. Unable to play cousin from a Mac, I phone, or I pad with him using a Microsoft device and steam. Starting to feel like all my money was wasted as beating my cousin in meaningless card games was the only solace I've ever taken in life. PLEASE WIZARDS.

Not only is connecting a Historic/Friendly Brawl against a friend convoluted in it's execution. It's now broken and extremely frustrating to constantly get disconnected and have the game lock up. This happens on mobile and PC. My decks are being put in as having errors for no reason since all cards in my deck are legal in the format and editing them constantly to make them show up as an option to play then get dumped back at the bottom of the page as unplayable again a day or so later is ridiculous. Please fix this soon as I am unable to play with my spouse and enjoy an evening game of digital magic. Table top it is until you get your bugs squashed.

Adding log information. Hopefully helpful. This is the player.log in APPDATA location. It should contain only a log info related to:
1. Opening the game via Steam
2. Immediately selecting direct-play, choosing standard/best-of-3, selecting my opponent's name, selecting a deck
3. Hitting "Play", and receiving the related error after a short delay

There are hundreds of reports of this issue and up-votes across your support forum (here is another example: https://feedback.wizards.com/forums/918667-mtg-arena-bugs-product-suggestions/suggestions/44049276-unable-to-submit-deck-friendly-play) and when we contact support they just tell us this is a known issue and to add our up-vote to threads like the one I linked.

Why then, is it not listed as a known issue?
https://mtgarena-support.wizards.com/hc/en-us/articles/360000091646-Known-Issues-List

Please prioritize this and help us. Acknowledge the issue since it's literally unplayable... we cannot connect to friends and play, which is the core base expectation of the service... In any other application this would be considered a top priority, unbreak-now situation with status on the main page until resolved... it's Magic "the gathering" and we can't actually gather/connect and play. Please take it seriously.... you have people that pay literally thousands of dollars to gather & play with friends. There is no other game that collects thousands of dollars from customers and its completely inoperable.

Let me know how I can help you help us.

Glenn

This has been happening to me for weeks now. It is extremely frustrating. Please fix this ASAP

2023.31.0.4709.1039979 version
It's working one day for friendly match, but not since 19th novembre.
Error server....

This app is a joke. It's essentially a digital storefront for cards you can't actually play because the game can't even match you up properly. Consider yourselves cut off from my wallet, Wizards.

Anyone else getting unable to load deck error message when challenging a friend ? And it's only with 1 specific friend not all of them. We are both on IOS.

I just invited a friend to install Magic arena for us to play together, for my surprise it's not working. Is there a possibility to fix this bug?

I was going to buy a bunch of gems for more LCI drafts, but I'm not spending anything until this bug is fixed. It's absurd.