ItemAdded not firing with REST

Question

I have an ItemAdded on a list which creates a Document Library for each item added, and updates some fields of the item.

It fires perfectly when items are entered manually.

It doesn't fire when items are added via REST - for testing sake I am authenticating with system administrator account.

I'm using SharePoint Foundation 2013.

Any hint?

UPDATE

The client is a Linux VM running a python REST client. Both the SP and the Linux VMs are connected to a 192.168.21.x network; digging into the logs with ULS I see many "Cannot find site lookup info for request Uri http://192.168.21.8:25011/"

I'm investigating on AAM

Answer 1

AAM was the answer. The starting point is this link