Certificate problem with subdomain

I have setup a separate certificate for the subdomain btcpayserver.cryptokix.com , but i get 526 Invalid Certificate, while the main domain works. I have set Full SSL strict for the website, so i suppose it applies to the subdomain as well. What might be the problem? Thanks

(Also we do have a first-level subdomain , so the SSL should work as is. It’s btcpay.cryptokix.com)

How did you set it up? A 526 means it’s not using a valid certificate.

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