People can't hear me from my android device on Zoom

Hello,

I use Zoom in my place of worship, so people who can't physically attend are able to watch the service. I have noticed that when I use Zoom, the others in the meeting (people watching from home) can't hear the service from my device. I don't know why that is. I use a Samsung Galaxy A15, and I use its mobile data for connection. The meeting isn't hosted by me and I don't use my own Zoom account to join meetings, I join without an account by just entering the meeting ID. However, when I use another android device, Samsung Galaxy A13, and connect using mobile hotspot from the Samsung Galaxy A15, people can hear the audio from the service from home. The only difference is that when I use the Samsung Galaxy A13, I use an account to join the Zoom meting and that account is also used to host the meetings (where people on home join from). Does that explain why the audio can be heard by others in the meetings when using the Samsung Galaxy A13? Also a lot of people attend service physically and sing and pray, could the noise also play a part? Thanks.