iOS DeviceCheck API - GenerateToken gives error Code 0

Question

I'm trying to implement the new iOS 11 DeviceCheck API (https://developer.apple.com/documentation/devicecheck), but token generation always fails. I've tried on simulator and iPhone SE, with wifi and mobile data. Apple ID in settings is my normal, non-sandbox account.

This is an existing app for an organization - from the docs it sounds like the only configuration requirement is to make sure App ID is set up in the apple developer portal.

Anyone else having this issue?

The exact error message is:

The operation couldn’t be completed. (com.apple.devicecheck.error error 0.)

This is the code I'm using, nothing fancy.

if #available(iOS 11.0, *) {
        let device = DCDevice.current
        if (device.isSupported) {
            device.generateToken(completionHandler: { (data, error) in
                if let token = data{
                    print("token: \(token)")
                }else if let error = error{
                    print("error: \(error.localizedDescription)")
                }
            })
        } else {
            print("devicecheck not supported")
        }
    }

Hey! Did you happen to solve this? Thanks! – d0nut Apr 24 '18 at 00:53 — d0nut, Apr 24 '18 at 00:53
No, I gave up on it and went a different route – Miles Ressler May 01 '18 at 20:35 — Miles Ressler, May 01 '18 at 20:35

score 4 · Answer 1 · answered Apr 24 '18 at 17:47

4

In my case, this error was caused by my iPhone's time being horribly out of sync. I manually changed the device's time to be the actual, current time (Settings → General → Date & Time). After that, the error went away and I was able to generate tokens.

answered Apr 24 '18 at 17:47

abertsch

103
2
8

Did you have to get the exact time or was just the date fine? – d0nut Apr 24 '18 at 17:56
1

I went ahead and used the exact time. After a bit of testing it looks like there's about a +/- 5 minute window where you _won't_ get error 0. – abertsch Apr 24 '18 at 17:59
Gotcha, thanks for the update. This explains why I was getting this error earlier. – d0nut Apr 24 '18 at 18:53
1

I get this error on a device which passes device.isSupported and whose date & time is automatically updated, and as such correct to within a 5 minute window. We have app identifiers correctly set up in the developer portal. No idea why it isn't working :( – Alexander Gingell Jun 05 '19 at 12:54

score 1 · Answer 2 · answered May 21 '18 at 08:40

1

Your code seems fine to me. The problem is simulator. It won't pass device.isSupported. You need to run it on real device.

answered May 21 '18 at 08:40

atitpatel

3,104
1
24
34

1

I get this error on a device which passes device.isSupported and whose date & time is automatically updated, and as such correct to within a 5 minute window. We have app identifiers correctly set up in the developer portal. No idea why it isn't working :( – Alexander Gingell Jun 05 '19 at 12:54
I got this error on some device, too. Did you find any solutions ? – Suphakrit Nakhabat Oct 09 '19 at 09:46
What is the OS version of your device? – atitpatel Oct 09 '19 at 11:42
I use iPhone6s with iOS 11.3. – Suphakrit Nakhabat Oct 10 '19 at 03:21

iOS DeviceCheck API - GenerateToken gives error Code 0

2 Answers2