Hope it's the right thing to reply in this thread, but has anyone had recent experiences of issues with the apparently-really-uncommon 3L5N format? I only recently started going for status and flying a lot more, so not a lot of experience, but TIL my account is quite old and pre-merger. Wondering if it's so uncommon these days that I might start having issues with it.

It's not everyone's favorite partner, but I did actually happen to need LifeLock and so the United promo. Points are incredibly late, and apparently I finally got a hold of someone who was telling me that they were having trouble getting my MileagePlus number accepted. Perfect name match already confirmed of course