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I've just found the following script to "hijack" the skype: calling from Manage on the web to use Teams. Might help you guys...

https://github.com/CB954/SkypeToTeams/

I also changed it to a VBS Script from a Batch file so that the Command Prompt black box doesn't pop up.

https://github.com/CB954/SkypeToTeams/issues/2#issue-1147129654

Hope it helps you, it's been frustrating for us, using Manage.