We could not complete your purchase. in App Store

Exact same problem on my 2017 MacBook Pro macOS Mojave 10.14.6. All apps can't purchase and update. Has been gone through with Apple Support with all debugging steps, rebooting, safe mode, reset router, delete files etc. At the end, transfer the call to App Store supervisor and she would need few days to feedback to back-end team and get back to me... What?!!

Apple, if you listen here, please solve this problem ASAP!

[Personal Information Edited by Moderator]

Sorry I cannot help as I have same issue too. MacPro 5,1 running 10.14.6 and previously installed apps wont update, clearing caches, signing out, reseting DNS etc all do not work. I cannot even get a new app that have never owned or downloaded.

Started happening couple days ago, but no updates were installed or applied, was eventually able to update some installed apps asking for updates by multiple tries then, today simply cannot update.

Tried deleting app and redownloading and now cannot even do that even though the download from cloud icon is showing indicating that the app has been purchased before.

I suspect its back end issue as there are many reports popping up today 20 May 2020

I called support and ask this issue. And they say; There is no problem on your Apple Account please check your default payment method sometimes it may cause this type of problems. And I tried 3 different working Credit Cards and still nothing. (MacBook Air Late 2017, OSX 10.14.6).

Keep calm and carry on. This seems to affect Mojave systems only, and no doubt Apple will fix it sooner (sigh) or later. The problem will not be solved by re-installing Mojave or by any other suggestions put forward by Apple support.

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

Ask for assistance here: Get Support

Me too.. MacBook Air on Catalina and cannot install a new free app.

Same problem here, though the funny (or maybe not) thing is that it only occurs on my “obsolete” Mac Pro 5,1 (2010; Mojave). On a Macbook Pro (also from 2010 with High Sierra) I can download apps from App Store, and also on an iPhone 6S.

Have tried a re-install on the Mojave machine. No joy.

Same issue for me. I reset both my SMC and PRAM but have the same outcome. I can't boot up in Safe Mode (due to encrypted HW) to test that out.

I can't move to Catalina due to corp requirements requiring some 32-bit SW.

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.

Mojave App Store no downloads or updates, "We could not complete your purchase". Since yesterday, no downloads or updates.

This is happening on both my Mojave iMacs, but my old iMac with High Sierra and the old App Store and by the look of it iPhone and iPad are fine.

It seems to be just the Mojave App Store with me and as the other OS's are fine, my account can't be the problem.

Been driving me mad!

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.