In the future make sure to add which API you are referring to. Have you tried troubleshooting with scratchpad? How many SKU’s are you trying per request? Do you have a detailed response sample?

http://docs.developer.amazonservices.com/en_US/fba_inbound/FBAInbound_GetPrepInstructionsForSKU.html

https://mws.amazonservices.com/scratchpad/index.html

I am having the exact same error. We did not have this problem yesterday for the same sku. I also used the scratchpad to test GetPrepInstructionsForAsin with the ASIN for the sku and get an error saying my ASIN list is empty.

I opened a ticket. Hopefully we hear back soon.

I’m still trying to get the support case opened – they keep asking for more information before they escalate – which I provide then they ask for more.

This morning the issue is still occurring and they have not even escalated it yet. Very frustrating.

-John

Same issue here I have opened a case on it as well

No update on my attempts to escalate yet – only a message back from support that they have forwarded it to the appropriate team. No confirmation of the issue or any timeline.

We can’t inbound as we rely on this request.

If anyone here has not opened a case on this, please do to help escalate. I chose the “urgent” option as well.

-John

Just got confirmation another large seller seeing similar issues.

They suggested trying the same call “by ASIN” – which I did try…

I wound up getting a completely different error when trying that both through software + through scratchpad:

"validation error detected: Value null at ‘asinList’ failed to satisfy constraint: Member must not be null"

Just received an update from tier 2 support.

They had a glitch on deployment of some software and have rolled back to an older version as of about 5:15 PM EST today.

This seems to have fixed the “ForSKU” call however I am still getting errors on the “ForASIN” call (which luckily I don’t need).

Everyone else if you can let me know if you are seeing any issues with SKU or ASIN calls?

-John