Hi @Joah Lenzo
Thanks for visiting our forum. Microsoft Teams tag is mainly focused on the general issue of Microsoft Teams application troubleshooting. Based on your description, this problem is related to Teams Graph, which we are not familiar.
The following is for informational purposes only:
Are you trying to create tabs in the Teams channel? If so, it would be easier to implement it directly in Teams instead of Graph API. For example: Add a SharePoint List from your team site as a tab in Teams.
- In Teams, select the channel page. To the right of the channel name, select the + on the tab bar.
- Select the SharePoint tab.
- Select Lists to see existing SharePoint lists available from your team site. Select the SharePoint content to add as a tab in the Teams channel.
- Select Post to the channel about this tab checkbox to automatically generate and post an announcement in the Teams channel letting your colleagues know that you've added this tab.
- Select Save.
Hope the above information is helpful for you!
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