LetsEncrypt Certificate not trusted by Spohos XG Firewall

Hi folks

If create a Lets Encrypt certificate (pfx, fullchain cert) and uploaded it to my freshly installed Sophos XG (SFOS 18.5.1 MR-1-Build326).

The certificate is uploaded but shows up as untrusted (red cross). 

The chain of the certificate is: ISRG Root X1 -> R3 -> My Certificate

I search the CA Certs for R3 and it only shows two not related R3 certificates. It does not show an R3 only CA certificate.

I tried to upload the R3 CA certificate from the LetsEncrypt web site but Sophos XG tells me that there is already a certificate.

Can anybody help ? What am I doing wrong ?



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[edited by: emmosophos at 7:40 PM (GMT -8) on 8 Nov 2021]
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