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Amazon error code 300404

Andon Cord: unreadable evidence

Can block sales — fix with priority
What it means

Amazon could not read the document supplied.

How to fix it

Root cause identified 2026-08-24: every failing URL is s3://sparc-image-uploads-prod-eu/fix-issue-image-upload// — Amazon's OWN staging bucket for the Vendor Central Fix an issue image widget. These were browser uploads into Amazon's intake; Amazon lost the staged file and now 404s on its own reference. NOT submittable via SP-API (which only accepts public HTTPS), so your API sent bad URLs is wrong. Fix: ask Support to purge the dead s3 references, and re-upload via Vendor Central Image Manager — only for trading ASINs; 52 of the 77 are never-launched (Serious Grains flour range + Wild Elephant) and can wait for launch.

Who usually owns the fix

Amazon (raise it with your vendor manager — this one is not fixable from your side)

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