Most common reason preventing FW to advertise learned prefixes to other BGP peers is the loop prevention. Firewall will not advertise prefix if it peer AS is in the AS-path.
But without knowing you configuration it is shooting in the dark...
- Can you share high level topology of your BGP setup?
- Do you see the problematic routes in your bgp local-rib?
- Do you see the problematic routes in your bgp rib-out?
You can obfuscate any sensitive information (actual IP addresses, hostnames, etc)
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