Hi @Ben Lan
Gald to know that your issue is resolved! Since our forum has the policy that The question author cannot accept their own answer. They can only accept answers by others, and according to the scenario introduced here: Answering your own questions on Microsoft Q&A
I would make a brief summary of this post so that other forum members could easily find useful information here:
[How to install EWS managed API 2.2 on Exchange 2016 - Summary]
Issue Symptom:
How to install EWS managed API 2.2 on Exchange 2016
Solution:
I didn't have to do anything further. I discovered the api components for the program I need are built into Exchange 2016.
Reference Links:
Get started with EWS Managed API client applications
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