We could not complete your purchase. in App Store

me too.

Not only for US accounts. My Japan account and Taiwan account have the same problem.

I login logout App Store, reboot, clean NVRAM... many many times not fix.

Same problem. Upgrading to Catalina isn't option for me too

Same, booting into safe mode didn't help me , i reiterate this has only occurred (at least on my machine) since upgrading haha!!

to mojave

Same problem. But I'm on Catalina, so it's not Mojave only.

Happy to report it is now working for me, too.

It's working fine for me now.

Update: Phew! Thanks Apple for fixing the Mojave App Store issue.

I'm glad I was patient and it was fixed within a day.

Same problem here.

iMac Retina 21.5-inch, 2019 with Mojave 10.14.6. Cannot update or install anything from the App Store.

I have no problems on my old 2012 iMac running El Capitan.

Upgrading to Catalina is not an option.

Same Issue Mojave 10.14.6. Cannot update or download any apps. Reinstalled OS after deleting all data, tried Time machine backups , used different Apple ID. Doesn't work. Cant update to Catalina coz using a lot's of pro 32 bit software. my case 101092440005 I hope apple support will help us.

Same as most others here: 2015 Macbook pro, Mojave 10.14.6, US store Apple ID.

"We could not complete your purchase.

Cancelled"

I don't know if it's related, but this is the first time I've participated in the discussions here and when I tried to sign in with my Apple ID it took many tries in various browsers before it allowed me to input the verification code I was sent-- I got "failed to identify you" after putting in my apple ID and password while receiving verification codes on this computer, my iPhone and Apple watch.

Writing to Apple feedback to start

I get the same message too , sigh. And I have problems with Apple Configurator as well

Nothing can be dowloaded to my mac, with Mojave sic 😟

Reported feedbacks for MacOs, https://www.apple.com/feedback/macos.html

Apple configurator https://www.apple.com/feedback/configurator.html

iTunes https://www.apple.com/feedback/itunesapp.html

It is working for me now.

I had this exact problem. Noticed it yesterday (May 20) and spent a few hours trying to fix it as well. I use Mojave, not Catalina. I re-installed Mojave today (in-place, not clean install). Still didn't work. Gave up and figured it must be an issue on Apple's side, so I signed out of Mac App Store and signed out of iTunes and started doing other stuff.

I tried to download again a few minutes ago and it worked. It correctly asked me to sign into my account and then downloaded the app. I know I had tried this yesterday, so not sure if it was related or Apple is fixing the issue on their side.

Working for me as well since 5 minutes ago. US store. MacPro 5,1 Mojave 10.14.6

Tested on 2 different machines, working on both.

Issue for me started yesterday 05/20 and lasted till the time of this email.

Must have been something on Apple's end given that the same issue started at the same time on 3 different computers with no change on my end on any of them.

I am having that same problem as well -- signing in to this forum as well as appleid.apple.com doesn't give me the box to enter the code.... except on Safari on the Mac. Any other browser on the Mac or Windows 10 - it sends the code to my devices but there's no box to enter it and it immediately says it failed. HOWEVER, it just worked a few minutes ago on Chrome!

Had to call Apple support. The wait was too long and I had to go to a meeting before talking with the Mac App Store team, but when I finished my meeting... everything was working again.

My suggestion: Call 1-800-275-2273