Sorry - I should have been more clear. The error comes up in your Step 10:
I get an invalid argument type.
OrgDropDown is from the main screen, Contacts list, Organization field.
Notes datasource has the Organization field as a LookUP to Contacts list
A form can only accept one record at a time so you'd have to wrap it in a function that ensures only 1 record is returned (most likely the FIRST or LAST functions). A typical statement you might type into the Items property of the form would look like this.
If for some reason the wrong result is showing, you might have to add further arguments to the filter to ensure the correct record is selected. A unique value like an ID usually satisfies this problem.
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Features releasing from October 2019 through March 2020