For few network devices in NFA that snmp profile is not assigned.
Profile exists in CAPC. Trying the discover option from RA page. "says profile not found".
Release : NFA .10.0.6 /CAPC:20.2.1
Changing the tenant of a router in CA Performance Center can affect which SNMP profiles are available for polling the router interfaces
Move the router to correct tenant .Can follow below link to change the tenant details for the router