Syncing iPhone 11 Pro Max or iPad Pro 12.9 2020 to new MacBook Air M1 kills 3rd Party apps on those Devices.

Well, I tried something and it is working for 2 days so far (crossing my fingers)

• I checked that my old pc was dismissed from the list in the apple id (tap on your avatar in settings)
• I made a last backup
• I restored my iPhone.
• I restored my last backup
• I made a sync AS SOON AS the iphone was starting up and just BEFORE 3rd apps start to reinstall (all grey)

For my watch, apps didn’t launched at all but I just used the watch app on phone to unload/reload them from the list.

Worked for my ipad too.

After the full install of the backup i tried some apps and it worked. I plug/unplugged several times and next day too. All was working fine. The only thing that changed from first attempts was to sync as soin the backup is installed and before third apps start to install again. I also disabled the wifi connexion with iphone. Not sure it was a problem bit at least i avoid some automatic syncs.

Even new apps are installing correctly.

maybe also try to disconnect from apple id/icloud from mac and phone, reconnect mac then iphone just before restoring?

Updating to Big Sur 11.2.1 seems to have resolved all the issues for me. Sync is working properly now with my M1 MBP and both my iPad and iPhone.

Having the same problem with both an iPhone 12 Pro Max and an old iPhone 6 with an M1 MacBook Pro. Currently chatting with Apple Support via Twitter. I just tried to sync with iTunes on the PC to get the apps running again, but it doesn't appear to be working for me. The only way I've been able to recover is to erase the iPhone and restore from an iCloud backup.

I have noticed in the console logs (viewed via Configurator 2) that it looks like after syncing with an M1 Mac, the FairPlay encryption appears to die. I think something on the M1 Macs is corrupting one of the encryption certificates, causing any App Store app to fail to launch.

I've noticed at least two other threads on here with people having the same issues. It looks like it might be a more widespread problem.

Updating all my devices resolved the problem. Even with last big sur and ios betas.

The is certainly on of "the odd ones".

Personally, I have one of the new MacBook Airs and have been syncing my

iPhone 11 Pro just fine and all works as expected. Even updated the iPhone 11 Pro

to iOS 14.3 just a short time ago and after reading this post, double checked

my iPhone 11 Pro and all 3rd party apps are working just fine.

If I read correctly, it also did the same thing when trying to "fix" by connecting to iTunes

on a Win10 Machine.

It seems to me, that somehow some permissions/ownership validation

may some how getting corrupted. So you may want to try and start

back at ground zero, totally ground zero.

I tried the erase/icloud bkp but the problem came back two days later. I am pretty sure it’s a M1 bug so I will keep using itunes sync now. Hope they will fix it soon. Thanks for sharing too. Maybe itunes works for me as I was on oTunes all the time before Mac M1...

What exact version macOS is on the M1 Mac and what version of iOS/iPadOS

is on the devices?

I just connected to my M1 MacBook Air this morning (macOS 11.1) and backed

up and synced to my iPhone 11 Pro (iOS 14.3) with none of the resulting issues.

Out of curiosity, did any one try logging out of your AppleID on all devices

and computers and then log back in one at a time?

Yes, I have the same problem. At first I thought it was probably because of my iPhone, as it's too old (iPhone 6). Yet after I update my phone there's still this problem. And as long as I use a USB cable to connect my iPhone and my macbook M1, then all Apps (except the Apples') cannot be used. They all turn grey or just skip and skip and quit out. Every time I have to use my old MacAir to reset my iPhone.

Something I am doing is showing my iPhone 11 Pro when on WiFi set

and I believe it automatically does a backup if I plug in the charger.

Also, I just did a backup via WiFi and all was good.

Whether this means anything or not? Also, I noticed mention from two

of you that you had moved from backup/sync on a Windows machine

to an M1. Did you move your libraries from the Windows machine to the

M1 as well? Also, when you did connect to the new M1, did you receive

a 'Trust this computer" message. I know apps are no longer kept on a host

computer but there could have been some obscure/hidden authorization

somewhere in the library file.

I didn’t move any library from itunes. My music is on an external drive so i just added it to the mac M1. I only exported the playlists. All other things are backed up or sync via icloud. I didn’t use the windows migration as my fav or docs were already synchronised

No, I tried the same process but it did not resolve the issue for me. The only difference is I did not "remove my old PC from iCloud" because for me that means removing several working computers where I still use iCloud from my account.

I didn't move my library from my Windows machine or my old MBP either. Both the iPhone and the M1 were set up as new devices without migrating any data. The only data that "migrated" is whatever is stored in iCloud that synced when I first logged into my account.

And I've tried wiping the phone, as well as using a user account that's not logged in to iCloud, so I'm not sure that's the source of the problem.