@Busben777 The odds are that you used the wrong Apple ID to log in to the APNS portal. Check Settings->Global->Push certificates->MDM Push Notification Certificate to see if the Apple ID used to create the certificate was stored there (it's an optional field Jamf added to use as a reminder because trying to renew with the wrong Apple ID isn't as rare as one might hope).

If you still can't find the Apple ID for your APNS certificate Apple does have a group to help, see this page for contact options: https://support.apple.com/en-us/HT208643

Thanks for that. You got my hopes up that this was what I’d done. I have checked and it’s not - unfortunately.

What puzzles me is why I can’t wipe my devices with configurator using the Mac I provisioned them with.

Is there something I’m missing?

@Busben777 I don't manage iOS/iPadOS devices, so I don't have any practical experience with them, but I would expect if you put an iPad into DFU mode (see https://support.apple.com/en-us/HT212787) you would be able to do a  Restore on it with Apple Configurator.

Assuming you are using correct Apple ID, then you can not resolve this without contacting Apple. So don't waste your time looking for a solution. 

Awesome,

Thanks everyone for the help.

Looks like I will need to get in touch with Apple.