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I’ve always just called and asked....except NFCU, I sent them a secure message.
I don't think it matters whether you call or chat. If there is an offer on your account you will get it regardless, and if there isn't you won't.
Someone mentioned you have Chase cards. If so, not to be negative, but there's no point in even asking really, as they do not do permanent APR reductions. Be prepared for a no if you decide to ask. Discover is more flexible, but you do have to be out of the promo 0% period.