Hi @Keith Andrews ,
It seems that you're configuring Edge Legacy policies instead of Edge Chromium ones. "Configure favorites" policy for Edge Chromium should look like this:
If your test user is using Edge Chromium, then it is for sure that these policies won't apply to it. You need to download the administrative template for Edge Chromium, and here's a doc for you to refer to.
If your test user is using Edge Legacy, unfortunately Microsoft no longer supports Edge Legacy. We recommend upgrading to Edge Chromium get a better experience and support.
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Best Regards,
Shijie Li