Morning Solaikumar,
I was just trying to review your issue and so far i only step in two F5's Known issue that could match yours, the only difference is that both issues are for APM (But configuration sync is configuration sync, regardless the module -except ASM that requires specific activation- and in this case we do not have a problem with modules features but with synchronization).
I am sure that you could come to this one, but just in case. Both error supposed to be solved in v11.6 but just in case i would recommend you to open a case. I am sorry but unfortunately i cannot help you more.
These are the issues i found
Regards and good luck. If i come to anything that could help i will let you know.