Thanks Ahmed for all you help which helps me to move forward.
Right now my database shows Synchronized in both the server next to database name, this is normal or Primary shouldn't show Synchronized and just normal like other database name only?
The reason, i am asking because in Primary, My regular Database backup didn't happened and this was happened earlier too as soon as i removed Availability group and it started to show normal not Synchronized and database nightly backup works fine so i am just curious what i have to do for any AG Group database Primary DB backup work?
Thanks for your help!