GCM registration successful on iphone but not ipad

Question

I have a weird issue where I receive the following error only on an ipad device:

The operation couldn’t be completed. (com.google.iid error 501.)

During the GCM registration process to request a gcm token. i.e.

GGLInstanceID.sharedInstance().tokenWithAuthorizedEntity(gcmSenderID,
                                            scope: kGGLInstanceIDScopeGCM,
                                          options: gcmRegistrationOptions,
                                          handler: gcmRegistrationHandler)

I'm following the example to the letter. The same process works just fine on an iphone. I'm not sure what the difference between the two devices are and why GCM refuses to register on the ipad. Both devices are currently running iOS 9.3.1.

The header file indicates that this error corresponds to:

// Device seems to be missing a valid deviceID. Cannot
// authenticate device requests.
kGGLInstanceIDOperationErrorCodeMissingDeviceID = 501,

However, I'm not sure exactly what that means. Why would the iPad be missing a deviceID, but the iphone is OK?

If anyone has any ideas on why this is happening and can share some insight, I'd greatly appreciate it.

Thanks!

Answer 1

In the end we transitioned to Firebase as recommended by Google recently. Everything worked as expected.