I was using bangkok airport ground frequency and got clearance for push back and taxi to rwy and before take off i asked for frequency change from ground to tower and it was approved by ground then i tuned to tower frequency in right side pop up message was also displayed and it says tuned tower control and now i was transmitted departure clearance message the tower was not replaying and iam hearing the calls for ground transmission and Ground control is also saying change to tower frequency you are in control airspace and after some second i got violation
Device:iphone 15
Operating system: ios