duckDNS/Letsencrypt certificate seemingly OK, but digicert check says it is not trusted

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If you have these three files, then chain may not include the cert.

Open chain in an editor. There should be two blocks

-----BEGIN CERTIFICATE-----



-----END CERTIFICATE-----

-----BEGIN CERTIFICATE-----


-----END CERTIFICATE-----

If there is only one block, that's the problem.

Then merge both files (cert + chain) in one file, first cert, then chain, then use that (fullchain).

Then recheck the domain to see if that works.

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