I'm having a weird issue with my 2017 MacBook Pro TB on Mojave with no sound playing from external monitor.
I use my mid-2011 iMac as an external monitor with the MBP. When I have the MBP hooked up to my iMac with the thunderbolt port, sound plays through the iMac normally. Then a few minutes later the sound will cut out and not play anything until I disconnect from target display mode on the iMac (CMD + F2) and reconnect again.
I've had this MBP for a few days now and recently upgraded to Mojave.
I use my mid-2011 iMac as an external monitor with the MBP. When I have the MBP hooked up to my iMac with the thunderbolt port, sound plays through the iMac normally. Then a few minutes later the sound will cut out and not play anything until I disconnect from target display mode on the iMac (CMD + F2) and reconnect again.
I've had this MBP for a few days now and recently upgraded to Mojave.