Have a form that a record picker is used to select a client and am trying to get a encoded URL into a button that can be selected from within an Interface page and have the client pre-selected.
Have made plenty of Forms pre-filled encoded URLs (Button linked to formula building the URL), but cannot get this one to work - only seems to be for the Record Picker element
Have other URLs for this exact form that work fine, eg:

But when I try to pre-populate the record picker under Client (which selects record from a linked table) it just doesnt fill it. I have tired manually creating:
https://airtable.com/appgAgIX5zNGRiox4/pagqzLgwghd7xBloc/form?prefill_Client=Shane+Harris
Have also tried using the Prefilled Forms extension using field names or field ID and get the same result





