Adding OGC WFS as item in AGOL

[SyedAlAziz24]

Hello,

I've been trying to add this WFS (https://geo.spatialhub.scot/geoserver/sh_plnapp/wfs?service=WFS&authkey=d3905fdd-cc48-4d19-8960-022b...) as item on AGOL. But I keep on getting an "Service does not exist or is inaccessible" as a response. 

Oddly, it seems to work if I try to add it directly into a Web Map - but I would prefer to have it as an item on AGOL so I could use it for something I'm working on in experience builder.

I also tried to upload it as an item from ArcGIS Pro - but that doesn't seem to work as well.

Any suggestions on how I could get this to work?

Many thanks,