Were you able to find out the cause of this 500 error? I can't find any references to PKProvisioningErrorDomain in the Apple docs, nor have I had any luck trying to inspect the network traffic for the provisioning calls.

I don't think the error you're seeing is actually the PKPassKitError type and code: unsupportedVersionError. We have also seen this error, and I believe the 2 code is in reference to PKAddPaymentPassError.systemCancelled. I am guessing is thrown as a general error to obfuscate why it failed.

Also seeing this error. I do not believe it's actually a version error since the device I am using already has an active wallet that other apps can provision to. I believe these issues are the same, and that we're actually getting PKAddPaymentPassError.systemCancelled. Basically a generic error. https://developer.apple.com/forums/thread/772855

If you connect the device via USB to a Mac and use the Console app to view the logs, do you see any errors come up from the PassbookUIService? I've seen this error repeatedly, in which it seems to say a 500 was returned upon submitting my provision request with the completion handler. https://developer.apple.com/forums/thread/772879