Teams for Mac start minimized

neo_explorer84 "and the Hide tick box in users does nothing."

I had this too but fixed by:

1. Launch Teams

2. Right-click the Teams icon in the Dock 
3 Select [Options > Open at Login]

This will create a 2nd entry for Teams in the [System > Users & Groups > {Your_profile} > Login Items] list which you will need to also select "Hide"

Weird but works