Quick troubleshooting view
A user no longer manages to authenticate on Microsoft 365.
- Invalid password
- Account blocked or disabled
- MFA
- Test web connection
- Control account in Entra ID
- View login logs
- Reset the authentication according to procedure
- Correct Conditional Access Policy if it is in issue
- Re-establish license or account if necessary
Contextual technician plan
Use the Microsoft 365 portal.
“Test web connection” should produce an observation that clearly confirms or rules out “Invalid password”.
If the observation is normal, lower “Invalid password” in the ranking and continue with the next distinct check.
If the observation is abnormal, keep the evidence and investigate “Invalid password” first. Related action: Reset the authentication according to procedure.
MFA Status, Licences and Methods.
“Control account in Entra ID” should produce an observation that clearly confirms or rules out “Account blocked or disabled”.
If the observation is normal, lower “Account blocked or disabled” in the ranking and continue with the next distinct check.
If the observation is abnormal, keep the evidence and investigate “Account blocked or disabled” first. Related action: Correct Conditional Access Policy if it is in issue.
Remove code of failure and policy applied.
“View login logs” should produce an observation that clearly confirms or rules out “MFA”.
If the observation is normal, lower “MFA” in the ranking and continue with the next distinct check.
If the observation is abnormal, keep the evidence and investigate “MFA” first. Related action: Re-establish license or account if necessary.
If multiple users are affected.
“Check service incidents” should produce an observation that clearly confirms or rules out “Conditional Access”.
If the observation is normal, lower “Conditional Access” in the ranking and continue with the next distinct check.
If the observation is abnormal, keep the evidence and investigate “Conditional Access” first.
Repeat the same validation test after the correction and confirm the original symptom is gone. Validate stability before closing the incident.
Before changing configuration, record the current value and a way back.
Climb if log logs indicate a policy or risk requiring security analysis.
A user no longer manages to authenticate on Microsoft 365.
Causes probables
- Invalid password
- Account blocked or disabled
- MFA
- Conditional Access
- Licence or service incident
- User risk
Diagnostic étape par étape
- 1
Test web connection
Use the Microsoft 365 portal.
- 2
Control account in Entra ID
MFA Status, Licences and Methods.
- 3
View login logs
Remove code of failure and policy applied.
- 4
Check service incidents
If multiple users are affected.
Solutions possibles
- Reset the authentication according to procedure
- Correct Conditional Access Policy if it is in issue
- Re-establish license or account if necessary
Climb if log logs indicate a policy or risk requiring security analysis.