A number of things:
Embed does not work the way you think it does.

Embed put (most of) the contents of the Current Calibre record
into the book.
It NEVER rereads the Books Metadata AUTOMATICALLY. (bring it into Calibre:current record)
Your custom column #ASIN is showing a UUID style, not ASIN
(eg mobi-asin:
B00JN8QAU4 ) (I will
assume 
, your template parses {identifiers} for the value? )