Unable to create new Office365 application instance. Corresponding
Provisioning "Office365Application" for APS application Office 365 task fails:
APS Application Error: 403 Forbidden ... <head> <title>IIS 8.5 Detailed Error - 403.503 - Forbidden</title>
The following possible reasons are identified:
1. controller.pem certificate file contains redundant information.
'IP address and Domain Restrictions' IIS site setting is incorrect. It prevents Management Node <-> O365 Endpoint communication.
Make sure controller.pem file contains the only the public part, which starts with "-----BEGIN CERTIFICATE-----" and ends with "-----END CERTIFICATE-----" as per Installing Office 365 Application Endpoint on New Host guide article.
- Check the IIS settings according to the Securing Office 365 Application Endpoint Host documentation article.