I received an error Amazon MWS Error: XXXXXXXX is an invalid ASIN for ATVPDKIKX0DER
If AZinsight returns you an error saying this Amazon MWS Error: XXXXXX is an invalid ASIN for a certain marketplace.
This can indicate that Amazon:
1. Is not returning any information on this product such as weight, size.
2. Could be possibly blocking this ASIN from being sold.
You can verify this by checking the Amazon Revenue calculator. If you notice the amazon revenue calculator is not any data when you hit the calculate button, this is an indication this is the case.