CDC not picking up changes
Figured out what the issue was.  For some reason the primary database had been joined to the availability group but the secondary was not, do not know if another DBA forgot to join it when they restored or if there was an error.  Either way, this wasn't allowing the logs to harden so CDC wasn't picking up the changes.

Did a fresh backup of the primary, restored to the secondary and joined it up and CDC started working again. 

Thanks,
Tim