The same number is found here: Driver Installation
The site is served as a Google Search ad for “123.hp.com/setup”. Ad info: “Teraxel Global Corp” of the British Virgin Islands. https://adstransparency.google.com/advertiser/AR02718272054175465473?origin=ata®ion=US , lots of phony scam ads shown.
866-929-3156: I am unable to dial it.
Alternate number: 321-821-7477. Peter’s favorite color is red, Mark’s favorite is black. But neither one will sing the HP Printer Song for verification. This callback number has been reported before, here: