Make sure it`s product metafield, not product variant metafield.
Then, check if it is enabled for store front.
Single line text, if you choose to only store single value. If multiple values, then List of single line strings
If those first 2 conditions you are checking metafieldDefinitions, which is not the same thing as metafields. You need to change those 2 to product / metafield / key and product / metafields / namespace.
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