My android tablet started to show this error on last update (Mar 26th). My android phone do not show this error. Sometimes it starts to work when I restart the device and sometimes not. I tried cleaning cache and reinstalling.

got this problem after the Mar 14 update

Same issue for me. Changing my device name on Windows fixes it but I have to do it once a day. Mac has same issue but can't figure out how to get it working.

This is happening on my mobile device as well. If I switch to Wi-Fi it works, but over mobile data it won't work

Also receiving this error on my android tablet. If I use my phone hotspot, I can get past the error. But not with my wifi

No response on my cs ticket, but I can also connect again. Broken reward from story event in mailbox

it, works now

There is a hotfix, scheduled on Mar 7, 2024 16:30-19:30 UTC. May be it helps.
https://magicthegatheringarena.statuspage.io/

Same issue here.

I have the same problem and have confirmed that using a different account i can access the game without issues. This is terrible, i told support about this and how it would be linked to something regarding the account and support is saying they have no further means to help solve the issue which basically means i'm locked out of my account :( I don't know about you, but I'm not a F2P player and this is just absurd.

Here to parrot the MKM festival event deck scenario: if you had a bugged event where you couldn’t keep playing then you may not be able to log in after the update. This very much happened to me and there needs to be some word from WotC. The problem is too widespread to be all of our collective connections timing out or whatever.

Same here. Tried everything multiple times. When I tether my phone to my comp Arena works fine, but when I get on WiFi...get the error message. No idea what that can even mean. Restarted my router/flushed cache through terminal, uninstalled/re-installed...nothing.

Everyone just keep on messaging Wizards customer service. They have to try and work it out if we keep bombarding them!!!

same issue; updated on the phone first, got the error and then when I got home tried PC and got the same "Error Updating Data:" have uninstalled on both, cleared caches/data, etc

Here is the latest response from technical support admin. They just don’t care. Everyone help bombard them with ticket requests until this is fixed

Read further through the comments and noted comment regarding a glitch in the MKM Story Deck Event where you could no longer select a deck and keep playing event. Can confirm this happened to me prior to latest update, then following update got the "error updating data" issue.

Same issue as other commenters above--after latest MKM Alchemy update receive "error updating data" message. I'm a user on iphone/ios--I've tried uninstalling and reinstalling multiple times to no effect.

Response from techincal support:

"Thank you very much for working with us to try and find a fix to the issues you’re encountering. Based on the information you've supplied and the steps you've already tried, I’m sorry to say that we don't have any known solutions to the problem you're experiencing and are unable to advise you further.

You may want to review our bug submission site to see if any other players have found a way to resolve this specific issue. If you do find a solution, please let us know so that we can update our Technical Support articles and agent training with that solution. I encourage you to keep an eye on those articles for any updates that might enhance your play experience."

Please contact all the support to do something...

Its an account issue for most of us for sure. Try renstaling and creating a new account. If it works, is WOTC account problem not conection or system issue. I have heard is possibly related to a deck issue. Wondering how many days/weeks they will take to fix this. And what kind of compensation we will get for this...

Same here.

Same here, after the update i'm not able to get passed the "Error Update Data", happens on windows and android