So we use some custom extension attributes and our B2C and we are trying to filter on some missing data.
https://graph.microsoft.com/beta/users?$count=true&$filter=CustomExtension eq 'blah'
Im using beta simply for the ease of seeing the data.
However, come to find out doing my research that the customextension does not get applied to the B2C account.
Is there a way to use the filter to look for custom extensions that are NOT on the users accounts?
I need a count of all the users that do not have this customextension.