I'm having this issue with my phone. It was working fine until March 5th update and now I can't get in at all. I've tried it all. I might be a tech genius but the suggestions all seem pretty obvious and useless. Updated,reinstalled,reset...ect ..checked everything suggested.

Does anyone have any real help for this on mobile? I can't face this much reality without a distraction......

I'm having the same issue. I've reinstalled at least 10 times now and done every possible combination of suggestions from other people with this issue from the last year. Tried on phone, ipad, and desktop with wired connection, wireless, and mobile data, and I get the same issue. I also did a fresh download from Steam and Epic. Seems to be tied to the account. I played one game after the update and it booted me and gave me the error.

ログインできません

Tried the quick device name and language settings fixes. No dice.

Guess I'll pray that a full re-install magically fixes it tomorrow.

I'll have more time for productive hobbies if it isn't fixable, so that's a silver lining (or I'll just waste it on a better coded digital card game instead).

Deleted everything twice and reinstalled every way I could find. I cannot get connected.

I'm having the same issue. Tried everything to no avail.

“Error Updating Data” after updating in mobile iOS. Update fully downloaded many hours ago. Tried reinstalling, signing out/in on both wireless and phone data but with no success. I’ve been reading horror stories about this bug from people locked out of their account for days on end, also that it’s account specific? Bummer that it seems to keep reoccurring.

Broke for me on my Mac. Tried uninstalling and re-installing on my Mac and starting from Epic Games Launcher multiple times to no success.

I've been having this issue for like a month now. i did this yesterday and it fixed it but after i closed my app it broken again .... ... im not doing this every time i want to play arena </3

Flush DNS and Winsock ResetTo do so on a PC:
Close the MTG Arena client
Open a Windows command prompt (cmd.exe) as an administrator
Type ipconfig /flushdns and press enter
Type ipconfig /registerdns and press enter
Type ipconfig /release and press enter
Type ipconfig /renew and press enter
Type netsh winsock reset and press enter
Restart your computer and launch the MTG Arena client

Arena broke for me on PC. Works on Android. I wouldn't spend money on a mobile game I can only play on my phone. Unacceptable outage of service for a product I spent earth dollars on. Hire some laid off workers back on, apologize very nicely, and fix the dang thing.

Getting the Error Updating Data issue on iOS (iPad). Have tried updating iOS, deleting and reinstalling app, nothing works. I can sometimes play but it’ll drop me out of random games frequently. This sucks!

Been haveing this issue for almost 3 weeks now counting this one.
2 weeks ago, before the new set it was inoperable for a week.
Last week I was able to log in to do some dailies on. Thus week I am now yet again locked out of my account I tried reinstalling, uninstalling, and moved over to steam and none of it has fixed the issue. This issue only works on my PC version. What makes it even more aggravating is my redeemed a prerelease code on pc so I am unable to open the packs untill I can get back onto pc.

Had this with the Sparky patch, was off game for over a week, got it back up last Friday... and now it's doing this again. I've done the following:
Fresh install
Cleared cache/data/regedit
Restart computer
Restart router
Computer name not having weird characters
Language set to whatever the beta thing was someone suggested
Direct client instead of steam
so many other reiterations of uninstall, delete cache and registry, restart, reinstall
VPN to force update - works to get me online, then only works when on vpn. turn off vpn, back to the same error.

I'm at a loss, now.

I had this same issue. Solved it by using a VPN.
I used TunnelBear, it has a free version that allows you to update the game.

Do we have a solution to this issue yet?

Ive tried adjusting the time as suggested below but that didnt work sadly. Has stopped working on 2 pcs and my laptop with same error

Still having this problem on iOS, anyone else struggling? It's not the name of the device that's causing it.

I had a different issue - I was stuck at "initializing localization datatbase" which was a big hint from the start that this was a language-based issue.
After looking at the log file and messing with the problematic manifest file, I got to the "Error updating data" instead.

At this point, and after reading the workaround from kazzig#14858 I followed his steps, but also turned EVERYTHING I could from French (I live in France) to English - United States (except for Windows Display Language, and Voice.)
Rebooted as prompted, and I got past the issue !

While I'm downloading the update, here's some data that could maybe help figuring out why the issue is really happening ...
- Windows 10 user
- Fresh MTGA install (right after I first got stuck loading - uninstalled every version, and cleaned every leftover folder, including every appdata subfolder)
- Game language was set to English. I believe that was my last setting after doing some deck importing/exporting, because I usually prefer to have it in French.

- I tried the mobile app and NO ISSUE in there. Game language set to FRENCH.
- Once the game was updated, I went to my Decks, and one of them - a Brawl deck with Rygo as a commander - was showing 1 invalid card. Upon editing the deck, it highlighted NO card as being problematic; back to the Decks menu, warning picto was gone, as if none of this ever happened ... what ?!

I'm waiting for the game to finish updating before trying to turn everything back to my native language (including all of those Windows settings) to see how things go. I'll update here !

Windows 11

Everyone who has this error should check what version of windows they use,
I finally got MTG Arena working after updating my computer windows 8.1 into windows 10...
Maybe older 8.1 and versions don't work anymore after 26th update, and Wizards don't know it
or forgot to mention it...but for me all is good after updating...All the best to All

Got a fix for mine on reddit. uninstall/reinstall didn't clear this part out:

"HattoriHanzo
·
41 min. ago

Have you treid clearing the AppData and the Registry

C:\Users\hattorihanzo\AppData\LocalLow\Wizards Of The Coast

and

Run command "regedit" go here. Computer\HKEY_CURRENT_USER\Software\Wizards Of The Coast\MTGA