Error Code:

Error Code	50158
Message	External security challenge not satisfied. User will be redirected to another page or authentication provider to satisfy additional authentication challenges.
Remediation	The user is required to satisfy additional requirements before finishing authentication, and was redirected to another page (such as terms of use or a third party MFA provider). This code alone does not indicate a failure on your users part to sign in. The sign in logs may indicate that this challenge was succesfully passed or failed.