this happened a lot of times to me.
I was requesting for pushback on Expert server but Ground ATC was replying. Once I waited for 30+ minutes! There were no aircrafts nearby and some of them spawned later than me they got the pushback approved immediately. I requested again every 10 minutes, so 4 times but still no response. I really didnt know what to do so I ended the flight.
So what to do at this situations? Can I send the request pushback message once again? In what time can I send it once again? Can I get a IFATC report for sending duplicate messages because the ground did not reply??
Thanks a lot.