Can't unmute mic in team chat

Just earlier today I was using voice chat fine, but now whenever I join any chat, it just shows my mic as muted, and I can’t unmute it.

Please don’t send me to the troubleshooting page, I’ve done all that and it won’t work, just someone give me a step-by-step guide, I’m losing my patience.

Hey, Beesǃ It appears that you’re on a University connection. Businesses and school connections often have this issue with Overwatch VoIP (Voice over IP) and being unable to unmute is a sign that ports are being blocked. This is caused by type of network devices used or with specific ports that are blocked. You will need to discuss this with your IT department to check for VOIP issues and to whitelist certain ports. They may have made some changes to the firewall that is causing this issue.

I just pressed M which is the mute button, I had this issue and I was scouring for this but it was pretty simple. Hope this helped