Stratoserver Plesk default certificate issue

I want to set my default certificate for my Stratoserver.
But i get this error:

Could not issue a Let’s Encrypt SSL/TLS certificate for h232xxxx.stratoserver.net.
The “Certificates per Registered Domain” rate limit has been exceeded for h232xxxx.stratoserver.net. Let’s Encrypt allows no more than 20 certificates to be issued per registered domain, per week.

I did not register this server yet but i reach a rate limit. Why?
If i register a domain on the same server, it works.

This will be because there are more that 20 certificates issued in the past week to subdomains of stratoserver.net see Rate Limits - Let's Encrypt

The main limit is Certificates per Registered Domain, (20 per week). A registered domain is, generally speaking, the part of the domain you purchased from your domain name registrar. For instance, in the name www.example.com, the registered domain is example.com. In new.blog.example.co.uk, the registered domain is example.co.uk. We use the Public Suffix List to calculate the registered domain.

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