@VNZ 

Port 1900 is indeed UPNP

To my knowledge, the Deco M5, M9 and X range have the option to disable UPNP under Advanced in the App.  However, I do not think this is possible on the P9

Is there a specific reason you wish to disable UPNP?   There are a lot of articles online saying this should be disabled, but knowing people whoo have disabled, they usually live to regret it.    If you have any games console (XBox, PS, Switch), Echo device or some webcams they may stop working with UPNP disabled.  

XBox for example will give an error about strict nat and fail to connect online.

  @Philbert 

thanks for your reply. I'm slightly confused why the internet says it is an unsafe port; but even xboxes from microsoft (who seem to block upnp on windows by default).

maybe tp-link can take this as a feature request.