What I'm trying to achieve is to write data to hosted feature layer on ArcGIS Portal.
In Esri ArcGIS Portal Feature Service writer parameters I'm using this template: "Host" - https://myarcgisportal.com/arcgiswebadaptor/, and tried all options and accounts in "authentication type" - "Generate token", NTLM, Kerberos and both domain and ArcGIS accounts (ArcGIS Portal admin), it shows "the server at https://myarcgisportal.com/arcgiswebadaptor/ does not appear to be an ArcGIS Portal Instance".
Portal is federated with server and ArcGIS Data Store is configured.
Maybe something is misconfigured on Portal?
Any ideas would be much appreciated.
Thanks!