The code worked. It can be found in the Order Details, activated in the LOTRO Store. Everything is OK now. If any difficulties arise on the account after some time, I will add to the review.
This is the second time I've ordered an add-on to the game on this site. The code comes instantly) The only thing is that EA lagged this time and I thought I'd have to return the money, but no. The add-on works stably)