Static route not redistributing into BGP

Hello everyone,

Topology and config:

https://i.imgur.com/XTlMEKk.png

My perimeter firewall is having bgp neighborship with Singtel-ISP. Also per-fw is connected to internal routers (CORE-R1 & CORE-R2) and per-fw configured with two default route with different AD value (default route to CORE-R2 having highest AD value) and tracking is enabled so when it loses rechability with CORE-R1 , default route towards CORE-R2 will be in routing table.

Now i am not able to redistribute this default route to SINGTEL ISP, though redistribute static command is configured under bgp routing process.

I tried below config as well on per-fw.

prefix-list DEFAULT_ROUTE seq 5 permit 0.0.0.0/0

route-map DEFAULT_ONLY permit 10 match ip address prefix-list DEFAULT_ROUTE

router bgp 100

redistribute static route-map DEFAULT_ONLY default-information originate

exit

No luck.

Any suggestion would be helpful. Thankyou