Hi Chirag, finally get it worked. I think it was a problem with client VA (azure image). We realized that although VA connection test passed, ccg service was with some failure, as ccg version was not being displayed on VA details.
Trying-error, we deleted ccg directory and restarted VA. After that, ccg was recreated and all begin to work. As I do not know the reason, I should not recommedn to do it, as Sailpoint encourage to not alter VA.