Unable to Move Events

We are trrying to move events from one Calendar to another and the Move button is not displaying. After some troubleshooting, we see that the $core_v2_ui.ConvertContent function is not returning anything.

We then tried to fire a $core_v2_contentConversion.Convert call, and it returned an empty object. Lastly, we tried the REST API endpoint to convert the content and got a 500 error. 

How do we resolve this issue? $core_v2_contentConversion.ListTargetContentTypes is returning an empty array for Calendar Events. Is this the root cause of the issue?