My Microsoft account is completely blocked for interactive sign-in.

Based on the described symptoms (all web sign-ins blocked, ACSR form failing, but OneDrive sync still working), the account is likely under a protection/block condition on Microsoft’s side, not a local password or browser issue. Alias changes and MCT registration cannot be corrected manually by forums or client-side actions; account and alias binding must be handled by Microsoft’s automated systems and support flows.

Actions supported by the available guidance:

1. Use the Sign-in Helper for blocked Outlook/Microsoft accounts
   • Go to the Sign-in Helper: https://aka.ms/sign-in-helper
   • Follow the flow for “I can’t sign in” / “My Outlook.com account is blocked”.
   • This tool is the primary entry point for blocked Outlook.com / Microsoft accounts and can surface available support options if self-service fails.
2. Check whether the account is blocked or under a temporary protection lock
   • If the system reports unusual activity, high volume of requests, or a block, this aligns with the documented behavior where Microsoft temporarily blocks sign-in to protect accounts.
   • In such cases, avoid repeated attempts and wait at least 24 hours (up to several days) before trying again, as repeated attempts can reset the lockout timer.
3. Try alternative verification methods and networks
   • If a specific verification method (e.g., SMS or email) is blocked or rate-limited, switch to another verification method already associated with the account (alternate email, different phone number, or Microsoft Authenticator if configured).
   • Switch networks (e.g., from corporate/VPN to home Wi‑Fi or mobile data). Heavy suspicious traffic from a region or network can cause temporary blocks that may clear automatically.
4. Use the Microsoft services account reset page for OneDrive/Account blocks
   • For OneDrive-related blocks or “Your account is currently unavailable” messages, use the Microsoft services account reset page: https://go.microsoft.com/fwlink/p/?linkid=874120 and follow the on-screen instructions to check and reactivate the account.
   • If the block was triggered by recent verification or heavy sharing, it may clear automatically within 24 hours.
5. If verification codes or recovery flows fail with “try another method” or “service temporarily unavailable”
   • This can indicate a temporary block or rate limit on verification methods.
   • Recommended steps:
     • Try another verification method (alternate email instead of SMS, or vice versa).
     • Try another network.
     • Wait at least 24 hours without further attempts, then retry.
     • Use the sign-in helper again after the waiting period.
6. When self-service and recovery forms fail
   • For Outlook.com/Microsoft account sign-in issues that cannot be resolved with codes or password changes, use the guidance under “When you can’t sign in to your Microsoft account” (linked from the Outlook.com unblock article). That article includes a path to contact support.
   • Contacting support requires signing in with some Microsoft account. If the affected account cannot sign in, create or use another Microsoft account solely to open a support case and describe the blocked account and alias situation.
   • Moderators and public forums (including Microsoft Q&A) cannot manually unlock accounts or adjust alias bindings; account recovery and reinstatement are handled by automated systems and dedicated support channels only.
7. If the account is determined to be blocked or under review
   • Follow the “Request for Account Reinstatement” or “account reinstatement form” path referenced in the guidance for blocked Outlook.com/Microsoft accounts.
   • After submitting, do not send multiple requests; multiple submissions can slow down processing.

Given the constraints in the documentation, server-side identity or alias conflicts (such as MCT-related alias changes) cannot be directly corrected outside of these official recovery, reinstatement, and support flows.

References:

• Unblock my Outlook.com account
• Microsoft account has been locked
• Troubleshoot Microsoft verification code issues
• Reactivate an account that has been blocked
• My Microsoft account is blocked. - Microsoft Q&A
• Locked out of my Outlook account and recovery options not working - Microsoft Q&A
• Why can't I log in to my Outlook account? - Microsoft Q&A
• I need to speak with a real person and it seems impossible. - Microsoft Q&A
• Lock or block login attempts - Microsoft Q&A