Security restrictios Power BI

Thank you very much parry2k and v-yalanwu-msft  for your responses and,
I have been reading your responses and articles related and, as I understood, there are plenty of possibilities to share dashboards between different organizations. The question that remains to me is: When sending for example a planned invitation to a client, the server where these dashboards are hosted is an Azure Directory external from my organization? or does these dashboards hosted in our internal servers and the external user will have access to this part of our server? I need to understand this to make sure that I´m not breaking any rule in terms of cybersecurity.

I think is also important to mention that I have the Power BI Pro license, not the Premium one.

Regards,
Roberto