I got a letter from American Express asking me to call this number. The letter was issued by American Express Identity Protection Team.
I happened to be meeting with the local AMEX business development team today, so I asked him about it. He said the letter looked legit, but always call the number in the back of my card.
So I called, the rep asked for the number on the letter, and said that was not an American Express number. My cards are in good shape.
FYI - I have the Business Blue Plus and the Bonvoy business cards (and a bunch of personal cards). YTD spend on the business cards was about $120k. All legit business spends and no manufacturing spend on money orders, gift cards, etc. Thinking about getting the Business Plat now for the big spend bonus.