Hello,
This is a known issue being tracked at https://developercommunity.visualstudio.com/t/Cannot-load-Apple-certificates/1692185. There are temporary workarounds documented in the bug report. You could follow the progress.
Since you are using VS for Mac, try to download the distribution profile to your Mac from https://developer.apple.com/account/resources/profiles/list, and double-click it. Then open Info.plist
in your iOS project, select Manual Provisioning in the Signing section, and click Bundle Signing Options, select the correct certificates and provisioning profiles.
For more details, refer to
https://learn.microsoft.com/en-us/xamarin/ios/get-started/installation/device-provisioning/manual-provisioning?tabs=macos
https://learn.microsoft.com/en-us/xamarin/ios/deploy-test/app-distribution/app-store-distribution/?tabs=macos
This is a site for support, so please use the right site to requests new feature requests about a Microsoft product or report any bugs. If you want to report a problem about VS for Mac, see https://learn.microsoft.com/en-us/visualstudio/mac/report-a-problem?view=vsmac-2019
Best Regards,
Wenyan Zhang
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