Introducing Video Filters in Microsoft Teams Meetings

Here is my experience of what has to be done to allow the "filters" to appear for an end user....

go to TAC > teams apps > manage apps.  search for the app and make sure it is allowed.

Then go to TAC > teams apps > permission policies > select either your global policy or create a new one (which you can then apply to just yourself to test this Filter functionality).  Open the policy and in the section of "Microsoft Apps" click on "Add apps" and then find the "custom filters" app and add it, click Save at the bottom.  If you created a new policy and added this app to that policy then you will need to ensure you assign this policy to yourself / the users who are going to test "Custom Filters".
Now that you have updated this policy you just have to wait a little while for the policy to be applied to you / the users.  One thing I have found that helps with this is to wait a little while - about 1 - 2 hours.  Then sign out of your Teams app on your computer, and sign in again.  Then manually click on "check for updates" in the teams app.  This refreshes the policies and checks for any teams app updates as well.  Finally you should be able to start a meeting and when you enable your camera you find you have not just the video backgrounds, but also the video filters now as well.  The first time you select a custom filter you will be prompted to accept a user agreement to allow Microsoft to scan your facial features and store some of your biometrics data (interesting that they don't explicity say what and why they are doing this).  Once you accept the agreement then you can apply filters to your camera.