XC - Obelix table syncer list operation failed.... How can I check point?

As this could be related to the new CE Site Availability feature maybe redeploy the CE as if it did not upgrade successfully maybe it can't support this. Also check if something is blocked between the CE and RE like the domains that should be allowed and ports as something could have been added.

https://community.f5.com/t5/technical-articles/using-f5-distributed-cloud-appstack-amp-ce-site-survivability/ta-p/308161

https://docs.cloud.f5.com/docs/reference/network-cloud-ref