Comprehensive and Detailed Explanation From Exact Extract:

SSO issues are often related to cached session data, cookies, or browser artifacts. The fact that the user can access the company portal but not one specific SaaS tool suggests a session or token problem. Using a private/incognito browsing window allows a clean session to be initiated, which often resolves SSO conflicts.

A. Reenrolling MFA is not related unless access issues stem from failed multifactor authentication.

C. Bypassing SSO may not be possible depending on the SaaS tool and company policies.

D. Factory resetting a device is a last resort and unnecessary in this case.