This is not working with the current Hubspot nodes. I get an erros with bad parameter. This has been reported in the forum before quite some time ago
Perhaps the node needs to be updated inline with this doc from Hubspot?
Hey @Robm,
I have just given this a quick go and for me it appears to be working, Are you selecting the owner from the dropdown or by inputting an ID manually?
Also just fixed the typo in the field name.