SETTING PA SYSTEM USING CRS212-1G-10S-1S+IN

Good day,
need help. This is the first time using Mikrotek.

I am tying to connect 6 location for PA system.
all these location are connected to each other via Fiber connection.

The main office is using CRS212-1G-10S-1S+IN
whereas the other location is using RB260GSP

I am having a problem for the PA equipment to be connected from remote site and from main office cannot connect to remote site.
But from remote site, i can access other remote sites.

In term of Network connection, i still can Ping all the devices.

Please assist.