We released version 2.4 of the Nylas API.
This is a breaking change from version 2.3.0.
Changes
We fixed an issue where Microsoft authentication errors were returned as plain text. Now they return as a JSON object.
{ "message": "You've entered invalid credentials", "type": "auth_error", "error": "Wrong username or password for https://outlook.com/EWS/Exchange.asmx"}