Same. They completed it manually for me, but it's glitched: I didn't get the rewards associated with completing them.

For those with this bug, submit a Customer Support request with the Account Issues category. You want them to contact you and manually add the missing 10 dual-color starter decks:

https://mtgarena-support.wizards.com/hc/en-us/requests/new?ticket_form_id=360000022266

Grif's advice worked.

Not sure it helps, but when I check the deck that I'm supposed to play with, I don't have any of the cards of the Standard set.
Maybe the bug is somewhere when we are supposedly given the cards from the challenge?

I can't access the last match of each colour of the Colour challenge. How can I fix it? Can you help me, thanks.

Everytime I get to PVP section of color challenge (any color) it gives me a network error and won't let me though.

Grif solution worked for me to ^^ thx grif

Grif's solution worked for me. Thanks

Can play last battle in tutorial with white cards

I have the exact same problem in white blue black.. every time I try to complete the challenge it says *network error*

Same issues here. None of the fix ideas in the comments are working

Same issue. It isn't fair other players have a huge card advantage. Haven't been able to get the new decks for months

Unable to enter event error populates when trying the do the last battle of the color challenge.

I am able to play other game modes.

Network Error: Unable to enter event.

I’m on the last battle of the color challenge but it will not let me enter.

I can play ever other game mode.

2022.17.10.1448.942449

Color challenge 5 Liliana Vess results in Network Error everytime I try to play. Please HELP

No puedo continuar Jugand9

I cant participate in all color challenges.
When I press the challenge button, it shows a network error on the screen.
Such symptoms have continued for more than half a year.
Fix it quickly!!!!!!!!!

ACTUAL FIX: All you have to do is click the deckbox to open the editor, remove all spells from your deck, and add enough basic lands to make 60 cards, then play (lose) your game. Once you're done, should you ever attempt the same challenge match again, you will find that your deck still contains only basic lands no matter what the editor tells you nor how many times you try to edit it. HOWEVER, YOUR CHALLENGE WILL BE RENDERED COMPLETE, YOU WILL RECEIVE YOUR REWARDS, THE DECK WILL BE UNLOCKED IN THE EDITOR, AND YOUR CRIPPLING O.C.D. WILL AT LONG LAST BE QUELLED. If that's all you need to know, you can stop reading now.

The rest of you nerds out there can keep on reading as I explain, braggadociously, all about how I figured this out in about 30 minutes of tinkering while all the rest of internetdonia has been left scratching their heads for literally months. The first thing I noticed upon receiving the error message and checking my deck editor was that my deck only had 59 cards, and any attempts I made to fix this were met with an error message saying I had illegal cards (which was clearly false, as I had just joined Arena as a new user and had only the cards they gave me). I began removing cards from my deck one by one to see if the error message went away. It turned out that my hunch was correct: despite the glitch, the game still recognized basic lands as being universally acceptable. From a programming standpoint, this is probably a side effect of there being no limits to their play in any format (besides Commander where they are limited only by color identity and deck size requirements). It probably just made sense not to script any error message code for the basic lands to begin with in the off chance of (wait for it) some sort of bug that might make an otherwise acceptable deck fail to load properly.

Please comment below (above) and let me know if this fix worked for you, because it definitely did for me. As simple and effective as it is, I am honestly amazed that no one else seems to have figured it out sooner.

iOS I finished all the color challenges except for the last step of the black challenge due to a network error.