Activation Code Question

You need to reach out to your JAMF CS rep. They can guide you on what needs to be done about your activation code. Honestly, I'm shocked they have not already been in touch with you. 

As far as how JAMF should be have. Generally JAMF will work fine with an expired activation code, for a while at least.

As AJ said, you'll need to reach out to your CS rep. If you're unsure of who this is you can email success@jamf.com who should be able to help you with sorting an Activation Code for your instance.
From my experience, you usually have a week or two from the time your code has expired to sort it. Once you've got a new activation code and put it in, your instance should start working as normal straight away.

Cheers,
Matt

Thanks for the info!  I was able to get the activation code sorted out!  I'm am still unfortunately unable to see the iphone in JAMF that was added into apple bm and assigned to the JAMF MDM.  I have manually added ipads doing the same process and those have shown up in our mobile device list instantly from what I recall.

Any further assistance would be appreciated! 

If your activation code had run out it may be a case that your MDM Token has run out. Have you checked to make sure all your Tokens and Certificates are not expired?
Settings > Global > Automated Device Enrollment

If that's out of date, I would check Volume Purchasing and Push Certificates also :) 

Since the device was added while you were still having the issue, you may need to remove it from JAMF (Delete the profile if it is there) and then re-add it, fresh.