Microsoft says it will improve security across Entra tenants where security defaults are enabled by making multifactor authentication (MFA) registration mandatory. [...]
source https://www.bleepingcomputer.com/news/microsoft/microsoft-entra-security-defaults-to-make-mfa-setup-mandatory/
source https://www.bleepingcomputer.com/news/microsoft/microsoft-entra-security-defaults-to-make-mfa-setup-mandatory/