Lost the ability to run a Xamarin.Forms app to an iPhone physical device

Dimitris Mylonas 16

The problem that I have is that I lost the ability to run a xamarin.forms app to a iPhone physical device.
The problem seems to appear a month or so ago.
At that point 2 things happened that maybe relevant to the problem.
The first is that Apple required to enable two-factor authentication.
The second is that, the keychain on my mac was corrupted and after following the recommendation of a post, I reset the keychain.
Not sure if these 2 are relevant but seems that after these 2 events, I lost the ability to run an xamarin.forms app to an iPhone physical device.
I have a valid subscription to apple's developer and prior to this incident, I was able to run a xamarin.forms app on my physical device.

I have a MacBook Air with XCode 12.4 and Visual Studio 8.9.6 (build 6)
A PC (that I use for development) with Visual Studio (16.9.4)

From XCode, I can create a new app and able to run it successfully on a physical device!
Seems that XCode doesn't have any problems with development certificates and provisioning profiles.
From XCode (as you can see in the following images) I have access to my apple account, certificates and provisioning profiles

My Apple account from XCode

Available certificates and provisioning profiles from XCode

And from XCode, I can select automatically signing and I can run successfully the app on my physical device

Unfortunately, that process is not successful on my PC with Visual Studio.
I'm able to run a xamarin.forms on a simulator on my Mac but NOT on a Physical device
When I'm using Automatic Provisioning then the process is failing as you can see in following image

The messages that appear while trying to enable Automatic Provisioning are the following

Resolving certificate...
Fetching valid and locally installed signing identities...
Syncing certificates for "MyTeam" team...
Saving Apple Development certificates...
Syncing App IDs for "MyTeam" team...
Making sure that connected devices are registered in "MyTeam" team...
Syncing devices for "MyTeam" team...
Processing ios devices...
Syncing provisioning profiles for "MyTeam" team...
Saving iOS profiles...
Fetching additional data about profile's certificates and devices for VS: WildCard Development...
Downloading the list of devices and certificates for VS: WildCard Development...
Running update request for VS: WildCard Development...

Automatic Provisioning failed: Authentication service is unavailable.

In Visual Studio I'm not able to get certificates and provisioning profile (with the same account as in XCode)

Manual provisioning is not working either (perhaps because I'm unable to get certificates and provisioning profiles for my apple account)

The same behavior is for the Visual Studio on my Mac, when trying to get certificates and provisioning profiles for my apple account

Any thoughts on how to solve this problem?
Thanks

JarvanZhang 23,951 Reputation points

2021-04-19T12:23:33.96+00:00

When I'm using Automatic Provisioning then the process is failing as you can see in following image

Hi, DimitrisMylonas. Have you accepted the latest service agreements? If the automatic provisioning process fails with the error message Authentication Service Is Unavailable, sign in to either App Store Connect or appleid.apple.com to check that you have accepted the latest service agreements.

Check the doc: https://learn.microsoft.com/en-us/xamarin/ios/get-started/installation/device-provisioning/automatic-provisioning?tabs=macos#troubleshoot
Dimitris Mylonas 16 Reputation points

2021-04-19T12:34:28.757+00:00

@JarvanZhang I'm getting the following from AppStore Connect and I already asked the administrator to accept it. The problem that I was describing is not new (perhaps more than a month). The "warning" that I got in App Store Connect is quite new (less than a week old)
In any case I will ask the administrator again to accept it and I will let you know
JarvanZhang 23,951 Reputation points

2021-04-19T14:31:29.66+00:00

Waiting for your update.
Dimitris Mylonas 16 Reputation points

2021-04-19T18:03:15.007+00:00

@JarvanZhang The new agreement was accepted (as you can see in the following screenshot) but the problem persists.
JarvanZhang 23,951 Reputation points

2021-04-20T07:54:02.58+00:00

Here is a similar issue case which provides serval workaround, please check it.
https://stackoverflow.com/questions/66789749/error-adding-apple-developer-account-authentication-service-is-unavailable
Dimitris Mylonas 16 Reputation points

2021-04-20T18:11:06.917+00:00

@JarvanZhang
I think that I found the problem. The problem is in the provisioning profile “VS: WildCard Development”
We are 2 developers. Before the two-factor authentication, we were both using the same account (my account) and that provisioning profile was available to both of us.
Looking at the “VS: ” provisioning profile I found out that is created under my colleague's account. (perhaps the one created by me was deleted!)
As a result whenever I try to use automatic provisioning, VS cannot access the “VS” provisioning profile and fails to enable automatic provisioning.
I bypass the problem by creating specific certificates and provisioning profiles and set the app to manual provisioning. App is running on a physical device!
So the question is, how to create a “VS:” provisioning profile that can be shared between developers?
JarvanZhang 23,951 Reputation points

2021-04-21T09:29:10.547+00:00

Congrats! Automatic provisioning will by default attempt to create and use a wildcard App ID and provisioning profile instead of an explicit App ID. But in some cases, an app's entitlements require an explicit App ID. Please check: https://learn.microsoft.com/en-us/xamarin/ios/get-started/installation/device-provisioning/automatic-provisioning?tabs=macos#wildcard-app-ids