with module domain-acces, we can manage domains and subdomains, example:
- domain.com is my first domain.
- user1.domain.com is affected to user1
- user2.domain.com is affected to user2
but user1 can connect to user2.domain.com that is my problem.
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Unfortunately, it looks like this isn't what Domain Access was intended to do, as its focus is "sharing information across subdomains" rather than restricting it:
In the comments there is a link to a code library that can achieve what you want, however.