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Unable to log into Teams app or browser on MacBook

Melissa C 0 Reputation points
2026-04-22T00:49:17.3733333+00:00

I just downloaded the free Teams app onto my MacBook and get the attached error when trying to log in. I've tried deleting the app, redownloading the installation program, and reinstalling but nothing works. When I click on Use Another Account, I see my name account but it still gives me this error. I get the same error when going through the web browser on my MacBook as well. I can log in with no problem on my iPad and Android phone. Help!Screenshot 2026-04-21 at 8.41.29 PM

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  1. AI answer

    2026-04-22T00:49:37.2633333+00:00

    Based on the context, the issue is a sign‑in failure to Microsoft Teams on desktop and web, while sign‑in works on mobile. The supported guidance is:

    1. Verify that the correct Microsoft account is being used and that it has the appropriate Microsoft 365/Teams entitlement. Teams requires a Microsoft 365 Apps for business or Enterprise license to sign in on desktop and web.
    2. Make sure the Mac has a working internet connection and that no firewall, proxy, or security software is blocking access to Microsoft 365 endpoints. If a proxy or network inspection tool is in use, it may prevent Teams from authenticating.
    3. If an error/status code appears on the Teams sign‑in window (typically at the bottom left), note that code and provide it to the IT admin or support, as many sign‑in problems must be fixed on the tenant or domain side.
    4. If the status code is one of the documented ones, follow the corresponding action:
      • For authorization problems (for example 0xCAA20003 or 0xCAA20004), confirm date/time on the Mac are correct and contact the tenant admin to verify Microsoft Entra ID policies.
      • For connectivity issues (0xCAA70004, 0xCAA70007, 0xCAA82EE2, 0xCAA82EE7), verify internet connectivity and have the admin check firewall or proxy configuration.
      • For credential mismatch (0xCAA90018), sign out and sign back in with the same Microsoft 365 credentials used successfully on other devices.
    5. If no listed status code is shown, or the problem persists after these checks, contact the organization’s IT admin or sysadmin with the status code and details so they can investigate the Office 365/Microsoft Entra configuration for the account and tenant.

    References:

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