CAT_FX_RATE_NOT_SUPPORTED indicates the price's currency cannot be converted by Snap's FX service. Switch the catalog's default_currency or product price to a supported ISO 4217 code.
Snap Catalog Manager's product schema has format and value rules per attribute. This issue is typically: missing a required attribute for the category, an invalid enum value (e.g., 'XL' submitted where 'M, L, XL' is the valid set), out-of-range numbers, or attributes that conflict across the feed.