Default-Route Doesn't show up in Forwarding-instance Routing Table.

I have a simple routing-instance config:

GuestWifi {
instance-type forwarding;
routing-options {
static {
route 0.0.0.0/0 next-hop 7.91.187.65;
 

But this default route doesn't show up in routing table:

rahmad@aus-srx345-001> show route table GuestWiFi.inet.0

GuestWiFi.inet.0: 2 destinations, 2 routes (2 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both

7.91.187.64/29 *[Direct/0] 23:41:00
> via ge-0/0/8.0
7.91.187.66/32 *[Local/0] 01:05:42
Local via ge-0/0/8.0

Any ideas why isn't the default route showing up?

When I try to ping out of this instance, it says can't assign this address:

aus-srx345-001> ping cnn.com routing-instance GuestWifi
PING cnn.com (151.101.128.73): 56 data bytes
ping: sendto: Can't assign requested address
ping: sendto: Can't assign requested address

Thanks.