Excluding break-glass account from MFA Registration Campaign – impact on existing users?

Excluding break-glass account from an active MFA registration campaign in Entra ID does not re-initiate registration for users who have already completed the process, nor does it alter their existing MFA configurations. Applying an exclusion simply ensures that the designated account no longer be prompted to register going forward.

https://learn.microsoft.com/en-us/entra/identity/authentication/how-to-mfa-registration-campaign

https://learn.microsoft.com/en-us/entra/identity/role-based-access-control/security-emergency-access