53003
Moderate
Microsoft Teams · Collaboration & Meetings
Sign-in blocked by Conditional Access policy.
Quick Answer
Error code 53003 on your Microsoft Teams Collaboration & Meetings means: Sign-in blocked by Conditional Access policy.. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Review Entra sign-in logs for policy result.
2
Use compliant managed device.
3
Complete required MFA and remediation.
4
Verify app/location is allowed by policy.
5
Ask tenant admin to adjust policy scope if needed.
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
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