Reason
Incorrectly entered Exchange Server URL
Solution
In Exchange Settings enter correct asmx url (Example Office 365 use https://outlook.office365.com/EWS/Exchange.asmx)
Exchange Error: The request failed. The remote server returned an error: (404) Not Found / Invalid URI: The format of the URI could not be determined / The response received from the service didn't contain valid XML / The request failed. The underlying co
