Mutual authentication for multiple services is also known as
biometrics
multifactor authentication
single-factor authentication
sso

Multi-factor authentication.

Explanation:

MFA is a security of the computer system which requires extensive authentication to verify a user's identification.

Mutual authentication gains adoption as an instrument that might reduce the risk of e-commerce crime. A link could only exist through mutual authentication unless the user accepts the digital certification of the server, as well as the server accepts the certification of the client.