Ok thank you. I will look into it as soon as I can. In the meantime, please let me know if you find a solution! I'm willing to bet that it may not be something that I can fix on my end : (
I had the same problem with Ubuntu 20.04 and fixed it by running this command in the Terminal :
"sudo apt install libopenal1"
It's a known issue in GameMaker Studio 2.
I tried on my desktop (I had the issue with my laptop) which is also a Pop!_OS 20.10 and the sound works this time.