I am using the Azure Portal App for Windows 10. Available for download from https://portal.azure.com/app/Download
When I go to Azure Active Directory > Users > Groups > Add Memberships
I select the distribution list and click "SELECT" I get the error above.
I get he same error if I use the browser version of AAD.
This happens on all browsers (Edge, IE, Firefox) in normal mode and incognito.
When I add the group or DL via the O365 Admin Center, it works perfectly fine.
Does anyone have any experience with the above?