I called past midnight Thursday to get E+ on two future reservations. CSR told me can only be done at airport. I asked for a supervisor who gave me some attitude and repeated the same.
I called again this morning and got a very pleasant CSR who switched all my seats to E+. They showed up within a minute on UA website. However, I notice that when I look at the seats online, the box on the side shows the $ charge for E+. I certainly didn't pay anything and assume this is just a fluke.