Thank you I understand I have been trying al kinds of ways to combine the files i get via Certify the web.
So I get a fullchain file via Certify the web that contains my certificate and the intermediate in one file I combine that with the private key also from Certify the web using CAT and then clean up the Windows CRLF so its only LF.
There a no extra line brakes other weird charterers, it is in UTF8 format but so is the *.schmiedmann.com certificate which comes from Sectigo and it validates ok.
The structure is straight forward..
-----BEGIN CERTIFICATE-----
Leaf for yourdomain
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
Intermediate (R3 or R13)
-----END CERTIFICATE-----
-----BEGIN PRIVATE KEY-----
Your private key
-----END PRIVATE KEY-----