Hello, we're in the process of transitioning to Microsoft 365. Currently I'm tasked with importing messages from our on-site Mattermost chat service.
I'm working with the Graph API to programmatically import the Teams, Channels, and messages into Teams.
Using the beta API: https://graph.microsoft.com/beta/teams
It errors out with the explanation that API is not supported in GCCH.
I'm just wondering if anyone has any suggestions or has run into a similar situation. I'm just looking for the best way to complete this task.