Cannot open hyperlinks from MS Office after uninstalling Muon

I had Muon on my surface pro. Installed Core. migrated bookmarks, etc.
Noticed that all hyperlinks from outlook, word, etc opened in Muon.
Uninstalled Muon. It didnt uninstall completely. Now hyperlinks give me the attached error message

Used Revo Pro to uninstall Core and everything it could find in Brave. Rebooted
Hyperlinks open fine in Chrome, IE, Edge.
However, Brave is still selectable as default browser. Cannot open hyperlinks at all. Rebooted
Reinstalled Core. when it opened it still had all my previously opened tabs in there.
Still cannot open hyperlinks from outlook.

What is the fix please?

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