Lost every Tahoe key?
On many 2007 to 2014 Tahoes with no key left at all, GM's own relearn sets the pace. The new key stays in the ignition while the security light burns for roughly ten minutes, and that cycle runs three times, so allow about 30 minutes on top of cutting the key from the VIN.
Push-start Tahoes learn the new fob through the OBD port, and a GM security timer may make the tool wait before the SUV accepts it. The bill is the key plus $60, so a 2022 fob comes to $229 plus $60.
We need to see title or current registration and a photo ID bearing that name, and the lost fob is erased so it cannot start the Tahoe again. For the full sequence, see lost car keys.