Apptoken gives error 22 ""sign-in required"" for some tables, not for others

Dear Neil: thank you so much for responding!
That is indeed an explanation. I found this reference: https://community.quickbase.com/quickbase/topics/i-am-trying-to-make-one-form-in-a-table-public-and-...

Though, eventually I arrived at authenticating using the QuickBase Client authenticate method.

Many thanks indeed!
--Allan