Hello @George_Thompson No, i just have 1 collaboration between Enterprise and our own agol. I did a test adding an item from a portal rest service but i cannot, i get an error adding layer, that is the error. I think that there is something regarding firewall or something that is why i am looking for that URL. Several years ago, Tech support send me a url with portal url, and other latters, https://gis.aee.pr.gov/portal/json&healthchekarcgis.com or something like that, what i remember is that this url check connectivity between portal on premise and agol, something like portal or server health check url, do you know something about this?