This post explains how to fix the “errorCodeTeamsDisabledForTenantForbidden” error when trying to add guest users to Microsoft Teams channel. This issue might arise when a user is invited to a channel in your organization’s Microsoft Teams for the first time. Fixing it usually just requires a flip of a switch, but might also include some waiting.
You get an error screen like this, when trying to join a Teams channel as a guest user.
No fear, though – likely an easy fix!
This is pretty simple: Teams usage is not enabled for guest users. The usage of certain services can be enabled for users with different kinds of licenses – and guest access is disabled by default. It nees to be enabled to allow external users (guests) to your teams channels, after which they’ll be added to your Azure AD as external users.
Solution: enabling Microsoft Teams license for guest users
To resolve the issue, you’ll need to do the following:
- Navigate to Office 365 Admin portal
- Access Settings > Services & add-ins > Microsoft Teams
- Enable Teams for Guest users (see below)
Luckily, this configuration should only need to be done once, and work after that for new users.
If it’s still not working, assign a license to the invited user (shouldn’t be required, but hell, you never know) and wait (for the Exchange Online mailbox to be provisioned).
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