Setting a default route with the Dialer interface as the next hop is not reflected in the routing table.
Example:
ip route 0.0.0.0 0.0.0.0 Dialer1
Even if you use the following command, the default route is not displayed in the routing table.
Example:
interface Dialer1
ppp ipcp route default
The products and OS versions used are as follows.
ISR1111-8PLTELA
XE SD-WAN OS 16.12.3
If you have any information, please share it.