DKIM CnameMissing for alderohotel.it stuck for 6 days - backend cache reset needed

DKIM for custom domain alderohotel.it has been stuck in CnameMissing status for 6 days despite correct CNAME records.

Tenant: alderotech (Microsoft 365)

CNAME records published on Aruba DNS:
- selector1._domainkey.alderohotel.it → selector1-alderohotel-it._domainkey.alderotech.w-v1.dkim.mail.microsoft.com
- selector2._domainkey.alderohotel.it → selector2-alderohotel-it._domainkey.alderotech.w-v1.dkim.mail.microsoft.com

Verified via PowerShell Resolve-DnsName: records resolve correctly.

Get-DkimSigningConfig -Identity alderohotel.it returns Status: CnameMissing.
Set-DkimSigningConfig -Enabled $true fails with CNAME validation error.

Microsoft support diagnostic tool also shows CnameMissing.

Requesting manual backend cache reset for DKIM signing config on alderohotel.it.