Error on Downloading WSDL in CRM Online 2015

I'm trying to download the WSDL from the developer source(Settings>Customization>developer source) but when i try to click the "Download WSDL" this error always pop up. it also the same error when i tried to click the other downloads. I'm using CRM ONLINE 2015. We need to this to connect our SQL using ODATA for reporting services.

Error
An error has occurred.

try this action again. if the problem continues, please contact your.....

I find an article related to this but the solution is for On Premise
https://community.dynamics.com/crm/f/117/p/179290/442010#442010