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Marloo can't join Microsoft Teams meetings

How to update your Teams admin settings to allow Marloo to join as an external participant

Hardy Michel avatar
Written by Hardy Michel
Updated over a month ago

If you're seeing this error when Marloo tries to join your Microsoft Teams meetings:

"Authentication failed – Marloo was unable to authenticate with the meeting platform"

This happens when your organisation's Teams settings are blocking external participants from joining meetings.

Who needs to fix this?

You'll need either:

  • Someone in your organisation with Teams admin access, or

  • Your outsourced IT support provider

If you use an IT provider, forward this article to them or introduce us via email and we can work with them directly.

The fix

Three settings in the Teams admin centre need to be enabled. All three must be turned on for Marloo to join successfully.

Setting 1: Meeting Settings (Organisation Level)

  1. Go to the Teams admin centre at admin.teams.microsoft.com

  2. Navigate to Meetings → Meeting settings

  3. Under Participants, turn "Anonymous users can join a meeting" to On

  4. Click Save

Setting 2: Meeting Policies (User Level)

  1. Go to Meetings → Meeting Policies

  2. Find the policy assigned to users who need to use Marloo

  3. Under "Meeting join & lobby", ensure "Anonymous users can join a meeting" is set to On

  4. Click Save

Setting 3: Let Anonymous People Join

This is the most commonly missed setting:

  1. In Meetings → Meeting Policies

  2. Look for "Let anonymous people join a meeting"

  3. Set this to On

  4. Click Save

If the above doesn't work

Check these additional settings:

  • Guest Access: Go to Users → Guest access and ensure "Allow guest access in Teams" is On

  • External Access: Go to Users → External access and make sure it's not set to "Allow only specific external domains" (or add gomarloo.com if it is)

Testing the fix

After making these changes:

  1. Wait at least 30 minutes (changes can take a few hours to take effect)

  2. Create a test Teams meeting in your calendar

  3. Join through Marloo using "Send Marloo Now" and "Join"

  4. Marloo should appear in the waiting room where you can admit it

Troubleshooting

  • Settings already enabled? Try toggling them off and back on, then save.

  • Still not working after 24 hours? Contact our support team with a screenshot of the error and confirmation of which settings have been changed.

Reference: Microsoft's guide on anonymous participant access

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