Application Delivery Analysis versions 11.1.3 and older is not compatible with NetOps Portal 21.2.6+ due to encryption updates.
Due to security enhancements with the NetOps Portal ADA and RIB sync will not work anymore.
Please upgrade to the ADA 11.1.3 and NetOps Portal 21.2.8 and the apply the CU01 patch on on top of it:
ADA 11.1.3 + CU01 / PM 21.2.8 is required to sync to work as expected.