azure - Can't access office365 Calendar API -

i want access calendar rest api ruby application. i've created azure multi-tenant app, , configured it.

i'm trying access token resource "https://outlook.office365com/", error

'aadsts50001: resource 'https://outlook.office365.com/' disabled.' 

i can't find description of error, , can't understand why it's disabled

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here azure app permissions:

that's new error me! let's check if exchange principals disabled. you'll need use remote powershell connect azure ad service.

here's how (i'm assuming have powershell installed on windows machine):

1. install azure ad module powershell: https://msdn.microsoft.com/en-us/library/azure/jj151815.aspx#bkmk_installmodule
2. open "windows azure active directory module windows powershell". follow steps under "connect azure ad" in linked article.
3. run following command: get-msolserviceprincipal -appprincipalid 00000002-0000-0ff1-ce00-000000000000

you should see output this:

extensiondata         : system.runtime.serialization.extensiondataobject accountenabled        : true addresses             : {} appprincipalid        : 00000002-0000-0ff1-ce00-000000000000 displayname           : microsoft.exchange objectid              : f7d177d5-2071-45a9-b494-9b98cb4d80e3 serviceprincipalnames : {00000002-0000-0ff1-ce00-000000000000/outlook.office365                         .com, 00000002-0000-0ff1-ce00-000000000000/mail.office3                         65.com,                         00000002-0000-0ff1-ce00-000000000000/outlook.com,                         00000002-0000-0ff1-ce00-000000000000/*.outlook.com...} trustedfordelegation  : true 

can run command , post results?