Connect To Azure Ad via Graph -"Expression.Error: Access to the resource is forbidden."

Good Mornig

I am trying to connect to Azure AD to retrieve Devices. 

After following a few posts  I went down the route of using https://graph.microsoft.com/v1.0/devices

I am loggin on with my Organization administrator account 

It loakds the data but when trying to connect to Devices I get "Expression.Error: Access to the resource is forbidden."

I have cleard the the Permission setting on various occasions. 

Logged on with Organization Account , Window Account 

Remand the User.Zip folder 

Ensured the Graph API has been granted all Read permissions

 not sure where to check anymore