There is no connection between the Steam servers and Turbine's servers for content purchases like the starter pack. Anything you purchase for Lotro on Steam is delivered to your Steam Account and Turbine doesn't know anything about it. You have to go into your Steam Account and retrieve the key code for your purchase. Once you have the key code. You log into Turbine's system:
and apply the key code to your Lotro account.
As far at the problem with purchasing Turbine Points via your Steam wallet you are going to have to contact Turbine account management directly either:
1) Submit an email ticket:
via the support and wait some days.
2) Call Turbine on the telephone:
when they are open --> Yula approved because I have no patience. I want this kind of problem fixed preferably within 120 seconds.
Unless stated otherwise, all content in this post is My Personal Opinion.