For special purposes, I offer subdomains to users.
I have Google Webmaster console access for my domain including all subdomains via domain property there.
However, I need to prevent my users from getting access to "their" subdomain via Google Webmaster tools. Currently, they can get access via customer1234.mydomain.com by using one of the methods that do not need DNS access such as HTML tag etc.
I do NOT want to prevent indexing (that would be easy). I just want to prevent them from getting access via the webmaster console.
Is there any way to prevent this?
I did not find anything, *GPT does not know. Maybe there is an undocumented DNS entry or some setting in "my" webmaster console access?