Microsoft Teams requires access to Google GSTATIC
You are unable to access Google GSTATIC through Microsoft Teams.
Teams presently requires access (TCP port 443) to the Google ssl.gstatic.com service for all users; this is true even if you're not using GSTATIC. Teams will remove this requirement soon (early 2020).
Microsoft is researching this problem and will post more information when the information becomes available.
Still need help? Go to Microsoft Community.