@Keit If you are having trouble, you can try connecting with your browser instead of the computer app. Sometimes it works better.
You can also check settings of your applications in your operating system, browser, firewall, or other software that block it.
Sometimes you do not know what to think. I had a situation yesterday when something was correctly set, but my Microsoft Teams app was blocking my microphone, and I can't get into our online stand-up with my job's teammates.
I had everything open in settings, and finally, I had open Chrome log into Teams, and I allowed my Chrome to use my microphone, then microphone start works, so sometimes you do not know what will work.
I can recommend Chrome to use in some critical situation because Chrome has various plug-ins which make easier to use Chrome in the situation when some additional software is running using the browser. Chrome also is more "brutal" to go through different restrictions which OS restrains.
But daily, and on the forum now, I am using Firefox, which is more respectful for privacy and freedom of the user.