The underscore "_" character is not valid inside the materials field
when creating and updating a Listing.
Therefore that particular validation error message is expected and
correct. Try using real space characters instead.
We are investigating allowing underscores in "materials" for writes to
match the format of reads. Coincidentally the infrastructure that
powers the taxonomy and materials is undergoing some changes and so we
would need to coordinate any API changes in these fields with that
effort.
Best regards,
Aaron Gardner
Developer API Team
Etsy.com
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