I am unable to login into my portal. it shows default directory sign failed. how to solve this issue

The error AADSTS5000225: This tenant has been blocked due to inactivity means the Azure AD tenant behind the portal sign-in has been deactivated because it was not used for a period of time.

To resolve this:

1. If the tenant became inactive recently (within the allowed reactivation window), the tenant administrator must contact Microsoft support and request tenant reactivation. Use the global support phone numbers listed under Microsoft support for business products and ask for help reactivating an inactive tenant.
2. When contacting support, provide:
   • The tenant ID shown in the error message.
   • The sign-in account (work/school account) used for the portal.
   • The exact error code AADSTS5000225 and that the tenant is blocked due to inactivity.
3. Optionally, try signing in directly with the tenant-specific Azure portal URL, replacing <TenantId> or <yourTenantName>.onmicrosoft.com with the values for the inactive tenant:
   • https://portal.azure.com/<TenantId>
   • or https://portal.azure.com/<yourTenantName>.onmicrosoft.com If the tenant is still within the reactivation period, this may allow access long enough to open a support ticket.
4. If the tenant has been inactive longer than the allowed period (more than 20 days in the documented behavior), it is deleted and cannot be recovered. In that case, create a new tenant/account and configure Azure DevOps or other services again.

If access to the original tenant cannot be restored and a new tenant is created, use that new tenant when signing in to the Azure portal and Azure DevOps going forward.

References:

• No subscriptions found sign in error for Azure portal
• Troubleshoot Azure subscription sign-in issues
• Tenant inaccessible due to inactivity - Microsoft Q&A