A cloud-based identity and access management service for securing user authentication and resource access
Hello Thestrius,
This behavior can occur when a personal Microsoft account (@outlook.com) becomes associated with an external Microsoft Entra ID tenant (typically as a guest user).
Why you see another company’s subscription
- Your account has likely been invited to another organization’s tenant in the past.
- Azure Portal is redirecting you into that tenant.
- You are not actually granted access — access is blocked by that tenant’s Conditional Access policy, which is why you see the error:
Why you are stuck in a sign‑in loopAADSTS53003: Access has been blocked by Conditional Access policies.- The external tenant’s Conditional Access policy does not allow token issuance for your account.
- Because the token cannot be issued, Azure Portal keeps retrying authentication, resulting in a loop. How to fix the sign‑in loop
- Sign in to https://myaccount.microsoft.com
- Go to Organizations
- Locate the external organization and select Leave organization
- Sign out completely and sign back in to https://portal.azure.com
If the Leave option is not available, the external tenant’s administrator must remove your account from their directory.
Regarding AADSTS53003
This error simply means Conditional Access is blocking the token, and the resolution depends on the sign‑in flow being used.
Non‑Interactive flows (background service / automation):
- The account or service principal must be excluded from the Conditional Access policy, OR
- Switch to Client Credentials (app‑only) authentication
- Alternatively, redesign the flow to require interactive sign‑in
Interactive flows (user sign‑in):
- The application must prompt the user to sign in interactively
- The tenant administrator should review Sign‑in Logs → Conditional Access to identify which policy is blocking access