Media Volume is automatically adjusted while microphone is in use

Hi sir_subecho,

Thanks for those extra details, as it clears up what exactly is happening.

Now that we know exactly what's happening, this does sound like expected behavior as it only occurs with Bluetooth headphones, and not with the built-in speaker. To explain this, we recommend reviewing this entire article: If sound quality is reduced when using Bluetooth headphones with your Mac

If you'd like to provide feedback about this, you can submit yours here: Product Feedback

While we believe this to be expected behavior from what you described, if you feel this isn't expected behavior after reading through the article above, we recommend reaching out to Apple using this link: Get Support

Have a good one!

Hey there sir_subecho,

We'd like to help by looking into what's happening while your mic is in use.

Some of the details you provided are unclear, and we'd like to make sense of them by confirming the following:

1. You mentioned this occurs in video streaming services, but usually, these do not use a mic. Please provide us more details about this. The more we have, the better equipped we'll be to assist.
2. You also mentioned that it occurs while using video conferencing apps(Zoom, Discord), but you also mentioned it occurs in other applications. Does this occur in built-in apps like FaceTime?
3. Any app updates available? This link shows How to manually update apps on your Apple device.
4. Have you tried a restart of your Mac? Check out the section 'Restart' here: Log out, sleep, wake, restart, or shut down your Mac
5. When did this first start?

Cheers!

Hello sir_subecho,

While multiple people may be reporting the same thing, there are different possibilities for what may have caused this particular issue. Let's focus on your own Mac for now:

1. Moving forward with troubleshooting the issue on your Mac, it does sound like this may be an issue with the amount of traffic occurring. You mentioned this only occurs while using a video conferencing app, and only when starting to play a video from a streaming service at the same time. To confirm, does the issue remain even after closing out of the streaming video service while still using the video conferencing app? You may need to wait a little while for it to adjust after closing the video completely.
2. You also mentioned that it 'probably' occurs while using FaceTime. As we'd like to make sure, when you checked, does it occur?
3. Does this also occur when not using any headphones at all, and just using the built-in speakers?

We look forward to hearing about all three details in your next message. Take care!