Free SSL for second-level domain bug (SLD 2LD)

Hello everyone,

I encounter the following problem.
It is possible to set SSL for second-level domain MyDomain.com.pl
but not with www prefix, and not for subdomain

When use SLD domain MyDomain.com.pl there is:
Domaine principal is com.pl
Sous-domaine www is www.com.pl
Sous-domaine spécifique MyDomain.com.pl

Maybe some of you found solution already.
Please share

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Thanks
Piotr