Hey #AAD & #microsoft365 #Identitiy Pro's,

does anybody have an idea how to change the Join-Policy for Security Groups in bulk?

The only way to change it officially is the MyGroups Mgmt Portal (https://account.activedirectory.windowsazure.com/r#/groups) which is not usable for bulk edits.

From reading the docs, it seems to be a design thing: https://learn.microsoft.com/en-us/azure/active-directory/enterprise-users/groups-self-service-management#group-settings

With F12 I see that the value for JoinPolicy changes when updating the Group from the Portal (check Screenshot)

I can't find any pendant for this setting in #MicrosoftGraph or #AAD #powershell

I recognized that updating the group within the portal also changes the Visibility:
https://learn.microsoft.com/en-us/graph/api/resources/group?view=graph-rest-1.0#group-visibility-options

But just changing this value, which is officially for #M365 Groups, does unfortunately not have impact on the JoinPolicy.