Certificate not valid for domain name

Hello, I hope you can help me out.
I'm stuck since yesterday.

I have serveral domainnames on ns1.aalex.org and ns2.aalex.org
I have a certificate of let's certify on several subdomains of aalex.org

I added a new domainname (aalex.net) and made a certificate and for https it's working fine but there are troubles with TLS.
I checked on serveral sites and they all give me the errror: Certificate not valid for domain name.

On another site i get the error:
Cert Hostname DOES NOT VERIFY (mail.mijneigendomeinnaam.nl != anderedomeinnaam.org | DNS:anderedomeinnaam.org | DNS:ftp.anderedomeinnaam.org | DNS:mail.anderedomeinnaam.org | DNSop.anderedomeinnaam.org | DNS:smtp.anderedomeinnaam.org)
so email is encrypted but the host is not verified

What am I doing wrong?
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