@launzone - I tried your method, although I get this response in Terminal at Step #4: "table access has 7 columns but 12 values were supplied". Do you have any suggestions for how to remedy this?! Running OS 10.11.6. Thanks!

Big THANK YOU @launzone - your solution works for me perfectly!

I followed LAUNZONE's fix from the march 30 comment. Fixed it for me!\

Catalina's permission issues are absolutely nightmarish :(

Please unity prioritize this issue (even though I'm sure it's Apple's fault in this case).

(ignore my comment below. Didn't realize your most recent post was the workaround to try)

@LAUWISMEMAR, what was your workaround?

Hey everyone, I know that this is not ideal and unity or apple should come up with a better solution eventually but here is what works for me and is pretty sure to work for everyone that can't add microphone or camera permission to unity hub. It is kind of weird and you have to disable SIP (system integrity protection) for a couple of minutes to do it, so maybe read up on that first if you are worried (I was not).

1) Disable SIP: Go into recovery mode (hold CMD+R when you restart your Mac) Don't be afraid, we are not doing anything crazy.

2) After that open Terminal (it should be accessible from one of the Menus at the Top) Type in "csrutil disable" and hit enter. Then reboot your Mac normally.

3) Open Terminal and type in: "sqlite3 ~/Library/Application\ Support/com.apple.TCC/TCC.db" and hit enter

4) For microphone access, type in: "INSERT INTO access VALUES('kTCCServiceMicrophone','com.unity3d.unityhub',0,1,1,NULL,NULL,NULL,'UNUSED',NULL,0,1541440109);" and hit enter

For camera, type in: "INSERT INTO access VALUES('kTCCServiceCamera','com.unity3d.unityhub',0,1,1,NULL,NULL,NULL,'UNUSED',NULL,0,1541440109);" and hit enter

6) check in your SystemPreferences/Security&Privacy > unity hub should now show up in both mic and cam

7) reboot in recovery mode again (CMD+R), open terminal again, type in: "csrutil enable" and hit enter, to enable SIP again

8) reboot normally and enjoy!

That's it! I hope it works for you. Don't forget the step 7, I think it is important for Security.

I thought I fixed this issue on 2019.3.6f1 but after Catalina update (10.15.4) I can't get it to work again. So it seems the mac os update messed up my camera permissions again for unity.
Permissions are not asked when running a project in 2019.3.6f1 and my app that uses the camera crashes inside the editor in playmode.
I used tccutil reset Camera to get rid of all camera permissions, uninstalled all unity versions, uninstalled unity hub, reinstalled unity hub and unity, but all to no avail.
I guess I need to move to a windows unity machine.

Hello,
I spot that Unity 2019.3.6 has proper key in Info.plist.... for camera, so it should work
https://imgur.com/3K6zA0j

But what about microphone? Same applies to microphone permissions.
Please fix it also for microphone.

Thank you

Just to give Unity guys a hint how to solve this issue:
https://developer.apple.com/documentation/avfoundation/cameras_and_media_capture/requesting_authorization_for_media_capture_on_macos

Hello.
I have same issue on Unity 2019.2.17f1 on freshly installed macOS Catalina 10.15.3
Solution with removing UnityHub and using Unity app directly works.

I can't believe that so basic OS functionality is not handled correctly by Unity - this is not new macOS feature which came yesterday. I think this issue is not related to Unity version it should be fixed in UnityHub since this process is starting Unity app instances.