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Hi @dbook1337
Thanks for reaching us.
To avoid GTIN missing error, use MPN = SKU and Brand=Brand(or any static name) field and regenerate and refetch/upload the feed.
Also, make sure you are not uploading any of those unsupported digital products – https://support.google.com/merchants/answer/6150006?hl=en
Please, let me know if you have any further queries.
Best regards,