UiPath Exchange Activities - What is the best practice?

Hi, Can someone help me with the below query?

We are using UiPath Exchange activities to read and send mails for a particular process. Currently there is no Server configured in properties and we are using Auto Discovery feature to identify the server. Once in a while we get errors saying “Auto discovery feature couldn’t be located” or “Underlying connection was closed”. It happens for either Get Exchange or Send Exchange.

Client is using Office 365 and I am a bit confused which will be the best practice for Exchange activities.

  1. Use Email Auto discovery
  2. Use server : “https://outlook.office365.com
  3. Use server : “https://outlook.office365.com/EWS/Exchange.asmx
  4. Use any of the above with a Retry Scope

All of them works but which will be more stable? Can someone help me understand this?