Can’t send dangerous goods to the warehouse

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I am trying to send dangerous goods to FBA. I always could do it but something changed and some products I can’t send. Some products have a similar error but it says that I need to try to send fewer products. I tried to send 1 product but the error persists.

The problem is that error doesn’t make sense because there are dangerous goods products that I can send to the warehouse and that means that there is an available fulfilment centre.

Support suggested uploading MSDS, I did it and it didn’t help.

Maybe someone is facing such a problem and has some luck in solving it.