Yes I have done those exactly as stated. This is the only trainer I own & I’ve been doing those exact steps since I got it. The trainer has worked perfectly until the last update & I haven’t done anything differently. I hear it tell me trainer activated & in the trainer it says game found trainer activated like normal but no matter what hotkeys I press nothing happens.
I don't think it's "no matter what", just try to keep it to a "reasonable" amount; no blatant/sudden 999M credits increases. I used the credits option only once to add 150M a half-year ago, and *knocks on wood* so far so good. I've also stuck with single-player mode racing against drivatars, and avoiding participation in online events. As with everything when trainers are involved though, YMMV.