MFA & Verification Issues

Fix Microsoft Planner Guest User Authentication Loop in Browser

Maira Mehtab Sep 22, 2026 869 views

Question details

Guest users are experiencing an infinite sign-in loop when trying to access direct Microsoft Planner links in their web browsers.

Product: Microsoft Planner
Device & OS: not provided
Scenario: A guest user attempts to open a direct link to a Microsoft Planner board.
Observed behavior: The browser enters an endless authentication loop, preventing the user from accessing the Planner, regardless of the network, account, or plan used.

Before you start

Before escalating the issue to an administrator, try clearing your browser's cache and cookies, or open the Microsoft Planner link in an Incognito/Private browsing window to rule out stale session data.

Solution 1Recommended

Reset the Guest User's Authentication Methods

Ask a Microsoft 365 administrator to review and reset the affected user's Multi-Factor Authentication (MFA) methods, as conflicts with Microsoft Authenticator often cause sign-in loops.

Authentication loops frequently occur when there is a misconfiguration or sync error between the guest account and Microsoft Authenticator in the host tenant's Azure AD (Entra ID).

Contact the Host Administrator

Reach out to the IT administrator of the organization that owns the Microsoft Planner.

Require Re-registration of MFA

The administrator must log into the Microsoft Entra admin center, locate your guest user account, and select the option to 'Require re-register MFA'.

Set Up Authentication Again

Once reset, click the Planner link again. You will be prompted to set up your Microsoft Authenticator app or chosen MFA method from scratch, which should break the loop.

Admin Privileges Required: Guest users cannot reset their own MFA status in an external organization's directory. This action must be performed by the host's administrator.

Solution 2

Open a Microsoft Support Ticket

If resetting authentication methods does not resolve the issue and it affects multiple guests across different networks, escalate the problem to Microsoft Support.

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Frequently Asked Questions

Why does the authentication loop happen for guest users in Microsoft Planner?

It typically occurs due to conflicting cached credentials in the browser, overly restrictive Conditional Access policies in the host organization, or a glitch in the Microsoft Authenticator integration for external accounts.

Can clearing my browser cache fix the Planner login loop?

Yes, if the issue is caused by stale session tokens or corrupted cookies, clearing your browser cache or opening the link in an Incognito/Private window can successfully bypass the loop.

How do I access Planner if the web version keeps looping?

As a temporary workaround, you can try accessing the Microsoft Planner boards through the Microsoft Teams desktop or mobile app, as the authentication processes are handled differently than in web browsers.

Do I need administrator rights to reset my Microsoft Authenticator methods?

If you are accessing a Planner as a guest in an external organization, you cannot reset it yourself. Their Microsoft 365 or Entra ID administrator must revoke your current MFA sessions and require you to re-register.

Login & Account Issues