Troubleshooting KB
Search by error code (for example AADSTS50076) or symptom. Each fix lists the cause, the steps, a PowerShell check, and the official source.
- AADSTS50076: why MFA blocks sign-in and how to fix itWhat AADSTS50076 means, the usual causes (Conditional Access, legacy or non-interactive sign-ins, scripts), and how to fix it without weakening MFA.
- Exchange Online mail lands in spam: fix SPF, DKIM and DMARCMail flow is healthy but your emails still go to junk? Check and fix SPF, DKIM and DMARC for Microsoft 365, step by step.