Activate the MFA option for Guest Users.

@Odette Garcia Thank you for reaching out to us, In addition to the information provided above, you might find the following articles helpful in addressing your requirements:

https://learn.microsoft.com/en-us/entra/identity/conditional-access/howto-policy-guest-mfa

https://learn.microsoft.com/en-us/security/zero-trust/zero-trust-identity-device-access-policies-guest-access

Let me know if you have any questions, feel free to post back.

Hi @Odette Garcia

Thanks for reaching out to Microsoft Q&A

Ideally, all users that have access to applications in your tenant should use MFA, especially Guest users.

I'm sending link below for your reference. It has several recommendations for guest users that you could use to evaluate and start using in your environment - https://learn.microsoft.com/en-us/entra/external-id/b2b-fundamentals

Thanks,

Fabio