Adding an external user to an internal TU Team

✅ Add an External (Guest) User to a Microsoft Teams Team

✅ Prerequisites

  • You are a Team Owner
  • The external user has a valid email address (business or personal)

  • Step 1: Add the External User to the Team

  • Open Microsoft Teams (desktop or web)
  • Select Teams from the left navigation
  • Find the team you want to collaborate in
  • Click More options (⋯) next to the team name
  • Select Add member
  • Enter the external user’s full email address
  • When prompted, click
    Add email@domain as a guest
  • Click AddUploaded Image (Thumbnail)

Uploaded Image (Thumbnail)

Step 2: Guest User Instructions

Accept the Invitation and Complete MFA Setup

These steps are completed by the external (guest) user.

Step 2.1: Accept the Microsoft Teams Invitation

  1. Open the email titled:
    “You’ve been added to a team in Microsoft Teams”
  2. Select Open Microsoft Teams
  3. Sign in using:
    • An existing Microsoft account OR
    • Create a free Microsoft account using the same email address

✅ Microsoft Teams will open automatically after sign‑in

 

Step 2.2: Security Verification Prompt

After signing in, the guest will see a message similar to:

“Your organization requires more information to keep your account secure.”

  1. Select Next to continue

✅ This indicates Multi‑Factor Authentication (MFA) is required by the hosting organization.

 

Step 2.3: Set Up Multi‑Factor Authentication (MFA)

  1. Choose a verification method
    (Microsoft Authenticator app is recommended)

If using Microsoft Authenticator:

  1. Install Microsoft Authenticator on a mobile device
  2. Open the app
  3. Scan the QR code displayed on screen
  4. Approve the test notification

✅ When verification succeeds, select Next

 

Step 2.4: Confirmation of Security Setup

The guest will see a confirmation message similar to:

“Success! You’ve set up your security info.”

  1. Select Done to complete setup

Step 2.5: Access the Team

  1. Microsoft Teams opens automatically
  2. If prompted, select the hosting organization
  3. Go to Teams
  4. Select the team the guest was invited to

✅ The guest now has full access according to guest permissions.

 

✅ Notes for Guests

  • MFA is required each time security policies demand it
  • Guests may need to switch organizations in Teams if they belong to multiple tenants
  • Private channels require separate access if applicable

 

 

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