ARC error codes

Hello,

I've added my domain to the ARC trusted sealers following this guide: https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/email-authentication-arc-configure?view=o365-worldwide

But the Microsoft validator is always failing. In the AAR header I can see the 34 error code, where can I check what this code means?

`arc=fail (34)` Is the exact message I can read in the ARC-Authentication-Results.