Missing user fields on subsite with WPO365 Login

I currently have a multisite setup using subsites and WPO365 Login for SSO. The Salesforce plugin works great on the main site and I have successfully synced the user accounts with Salesforce contacts. However, if I go to my subsite and try to add a fieldmap using the WordPress User Object, when I click on “Select WordPress Field”, no fields appear. If I select other WordPress object, everything works normally and I get a list of their fields. Is there a way to fix this?

Also, my main site has the user information and IDs I wish to use. I would like to sync with a Salesforce database that contains userids and subsite names. Is there a way to filter the import of just userids with a particular subsite name in the Salesforce database?

Thank you.