I have an issue with the zoom app on my Mac, could somebody please help?

So yesterday my friend sent me a zoom link.
Since I don’t like using zoom on mobile, I copied the link and sent it over to my email address which had my MacBook attached to it.
This is a MacBook Air, 2017.
But to be completely honest, my Apple ID also has other iPhones, an iPad and another MacBook attached.
Okay, so, I open the link on my Mac, and I allowed to do it thing.
Okay so now I’m in a meeting.
Yeah okay.
But nobody can hemi.
I can hear them, but they can’t hear me.
What?
Okay, so I got the link around in the settings, there’s an onion my mike option.
But it needs to access the microphone, so I need to go to system settings preferences.
Okay, so now I’m in the privacy and security, and I alarm zone to have full microphone access.
Okay, that’s perfectly fine.
I click close and reopen, basically restart the app.
I’m back in the meeting, was that supposed to happen? So I try again, try to unmute my mic.
Again need me to go to system preferences, even though I’ve already ticked the box.
Okay, what the heck is going on, I do it’s over and over and over again, but still it doesn’t work.
Weird!
Right, whatever,, maybe it’s an issue with the speakers
So I plug in my headphones
No dice.
What’s going on, why is this happening to me?