I have a client with two CMS (Hubspot and WordPress) on two different subdomains.
WordPress: www.domain.tld Hubspot: www2.domain.tld
The WordPress environment is used for the main website and the Hubspot is only used for the blog (yeah, I know, it's strange). The client wants to keep the Hubspot environment, but I'm not sure about the subdomain actually used (www2).
The www2 isn't used like a mirror.
I want to know if a subdomain like www2 affects the SEO.