A: When creating streams, they are set for numeric-only values. You need to specify that a stream is alphanumeric, via either the checkbox in the Devleoper portal, or via the parameter in the API call to create the stream. In this, the user created the "erroring" streams as numeric-only. The solution was to delete the streams in question and recreate them as alphanumeric streams. (You cannot change the "type" of stream after it has been created, unfortunately.)
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