@bfrytm
Are you running the FTD or ASA image on the FPR1150?
If FTD, what interface are you attempting to connect to using SNMP? SNMP configuration supports Routed and Diagnostic interface only, not the management interface.
If FTD, are you using FDM (inc via CDO) or FMC to manage the FTD?
Please provide screenshots of your configuration.