Amazon error 8555: Required attribute missing for this product type or variationA conditionally-required attribute is blank. These are fields that only become mandatory in context - for example size_name once variation_theme is SizeColor, or a unit column once you supply a numeric measurement.How to fix error 8555

Read which attribute the message names and which row it is on.

For variations, make sure every child SKU supplies a value for every dimension named in variation_theme.

Any numeric measurement needs its matching unit column filled - item_weight needs item_weight_unit_of_measure.

Fill the field on the parent row too where the template requires it, then re-upload.

All Amazon flat-file error codes