Hello,
I think your router is still in Plug and Play discovery mode :
*Jan 27 06:25:13.017: SDWAN INFO: PNP start, status: success
You would need to stop PnP before you are allowed to enter any commands.
pnpa service discovery stop
After this you should be allowed to enter commands via "config-transaction".
router# config-transaction
More info can be found here :
https://www.cisco.com/c/dam/en/us/td/docs/solutions/CVD/SDWAN/SD-WAN-End-to-End-Deployment-Guide.pdf
Regards,
Danny.