To add to the point above: it seems like we're all on the same page about how messy these tracking tokens make everything. I've dealt with those 404 e...
Honestly, ive tried a dozen of these over the years and most are just too clunky for older folks who hate making accounts. If you want something that ...
TL;DR: Double check your ASIN indexing and make sure every item has a matching quantity parameter or the whole link breaks. I have been in your shoes ...