Wildcard SSL issued by Plesk not working for subdomains

I’ve got a Plesk setup which issues Letsencrypt certificates and hosts part of my client websites. When passing the _achme-challenge and receiving a wildcard certificate / installing said certificate it seems that part of the subdomains which aren’t hosted with me still give a certificate error.

My setup in the DNS is currently as follows:

  • domain.com – A informational website hosted on my Plesk server.
  • dev.domain.com – A separate dev site hosted on another IP address eg 123.481.123.12
  • live.domain.com – Another application entirely, hosted by me and working with the current SSL

As far as I understand this, the other party from dev.domain.com also needs to install a wildcard certificate on their end? Or is there something wrong with my certificate itself.