I've used hardenize.com to validate grimstveit.no for mta-sts, which makes https requests towards https://mta-sts.grimstveit.no/.well-known/mta-sts.txt
Hardenize.com reports big issue while scanning: "Certificate chain is incorrect. This certificate is delivered as part of an incorrect certificate chain. The problems in the chain render the certificate invalid too. Although some clients (typically browsers) are able to fix or rebuild certificate chains, it's generally not safe to assume that all browsers can."
My domain is: grimstveit.no
I used this website: Hardenize Report: grimstveit.no
It produced this output: Certificate chain is incorrect
My web server is: apache24-2.4.48
The operating system my web server runs on is: FreeBSD
I can login to a root shell on my machine (yes or no, or I don't know): yes
I'm using a control panel to manage my site (no, or provide the name and version of the control panel): no
The version of my client is: acme.sh-2.9.0_1 (from ports)
acme.sh --version https://github.com/acmesh-official/acme.sh v2.9.0
All help is greatly appreciated.