M365 tenant emails marked as spam (SCL:5, CAT:PHISH) despite perfect authentication

Hello,

Our business emails from our M365 tenant are consistently marked as spam 
when sent to other M365 tenants, despite perfect email authentication.

Technical status:
- SPF: Pass ✓
- DKIM: Pass ✓ (recently enabled)
- DMARC: Pass ✓ (recently enabled)
- Composite Authentication: Pass (reason=100) ✓

But messages are still marked as:
- X-MS-Exchange-Organization-SCL: 5
- X-Forefront-Antispam-Report: CAT:PHISH;SFV:SPM

We suspect a tenant reputation issue, possibly because the tenant ran for 
months without DKIM enabled. Now that all authentication is correct, how 
can we request a reputation review?

Thank you!