I was mistaken. The script I have is for using PS to create Edge favorites, not import them. There's a GPO setting to automatically import favorites from another browser in Edge that may work.

I did have a link to this on my notes, which does look familiar: https://www.avantia.dk/blog/2020/5/13/script-to-convert-internet-explorer-favorites-to-managed-bookmarks-in-chrome-edge

I've found this yesterday. I'll use it