Complete admin lockout error 53003

Error 53003 identifies a Conditional Access block, so changing the administrator password alone will not remove the policy preventing token issuance. Because you report that every Global Administrator is affected, Microsoft’s documented recovery route is a support request when no administrator can change the policy. Use Microsoft 365 business telephone support if the admin center is inaccessible; if every subscription was purchased through a partner, contact that partner for support. Describe the incident as a complete tenant administrator lockout caused by Conditional Access. Have the tenant ID, affected administrator usernames, subscription information and domain-ownership evidence ready for private verification. From the failed sign-in’s More details panel, record the correlation ID, request ID and UTC timestamp. Microsoft must verify the organization before changing access controls. Domain ownership helps that investigation but does not provide a self-service bypass or guarantee an immediate unlock.