Creating an Alert when a new user is Added to a SharePoint site

Question

I've been tasked with securing a site collection that has an organization business pitches and contain competitive pricing info etc.
Global Admins and SharePoint Admins in 365 can grant themselves access by passing any security.
What mechanism can be created to alert Site owners if someone was gave themselves access?
Trying to be pro active and prevent issues, rather than going through event logs.

Answer 1

Hi @Albert Edelstein ,

Yes you could try alert policy to alert the administrator, please refer to this article for more information about it:

Alert policies in Microsoft 365

As mentioned:

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Answer 2

Seems like it is doeble from the Alerts menu.
https://blog.lsonline.fr/2019/01/24/sharepoint-site-alert-policy/