Update Feature service Issue

[jmchza]

Hi there.
Where can i find a solution to the following service?
The Nodejs service does work without any inconvenient but hitting the same service within Postman does fail with an odd message, pasted below:

After reading the official documentation there is nothing to suggest that the POST request we are preparing is wrong.
There seems to be a missing argument or an existing bug perhaps.

the link to the official documentation here: https://developers.arcgis.com/rest/services-reference/enterprise/update-features.htm
I would assume the rest-js app does hit the same endpoint after all.
Can anyone provide any feedback or help, we are building a different service and we cannot use the rest-js application.
Would anyone happened to know what is the issue here ?
Interestingly enough the add and delete feature operation works from Postman.
Any help will be much appreciated.