Replacement pattern for one value of a multivalue field in views
I had a similar problem, although not exactly the same.  Here's what worked for me:
 1. Enable the module entity_token which is a sub-module of Entity.
 2. Use field-tagging:0 (with a dash not an underscore).  Depending on exactly what you are trying to do, you may need a further parameter such as field-tagging:0:url.

It seems that field_tagging and field-tagging are two different things.  The first one doesn't accept :0.