Microsoft’s Remote Connectivity Analyzer

Microsoft provides a remote testing facility for their Autodiscover service. It can be very helpful.

https://www.testexchangeconnectivity.com/

Here’s some recommendations for how to use the Remote Connectivity Analyzer:

1. If you CAN NOT make the autodiscover work here then we won’t be able to make it work either.
2. If you CAN make it work here then we should be able to make it work.
3. If this autodiscover test works for you, you may still have problems on your local LAN. This can happen if you have an incorrectly configured on-premises (Exchange) autodiscover configuration and service. Even if you have clients running on-premises that are successfully connecting to Office 365 it can still be a problem for cloud-configured Office 365 accounts because the environment is a hybrid one.