Hi MagruderMan
We have just had the same error and it appears to happen when the username/password is not correct. The enrolment process continues but it will fail with the "invalid device id or no pcc user" error as there is not associated user for the device in the meraki framework.
If you get this error: Log onto the meraki admin console, find the device and you will find there is no user associated with the device. "edit details" add a user, go back to the device, open the meraki app, refresh the config and then add the afw account.
Hope this Helps!