video doesn't work on enterprise network

[David Phillips]

Works outside the network. Is there a published list of firewall settings that need to be configured, similar to Skype for Business Online?

[#2]

Have you checked the information about Office 365 IPs? There are some specifics for Teams: https://support.office.com/en-us/article/Office-365-URLs-and-IP-address-ranges-8548a211-3fe7-47cb-ab...

[#3]

Bingo - thank you kindly.