When you install Microsoft Teams and start to use it for as your default calling app you want Teams to open when you click on TEL: URLs on homepages.
A TEL: URL is in the E.164 format tel: ie. tel:+31205001500(not my number, its the dutch Microsoft number) and when you click on that Teams should open and you will be able to call that number without copying the number or type it manual in your Teams.
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