Auth error with Reader/Writer to Portal but Web Connection test succeeds

For Writer: if I change the Authentication Type from Web Service to 'Generate Token', fill in the appropriate credentials, the [...] file browser works, in that no error is emitted, however the following dialog is blank, no feature services are listed.

For Reader: if I change the Authentication Type from Web Service to 'Generate Token', fill in the appropriate credentials, then the [...] file browser works, and I can select a feature service and table.

I'm trying to connect to portal with the writer and getting this same situation. Did you ever work it out? I can use webservice connection to read, but using write generates same Type 3 error message. thank you in advance

Sorry nothing new to report. I haven't come back to this particular project in awhile.