VW Transporter 2019 Xhorse XSDM04EN Key Remote Not Working?

 Problem:

We are adding two spare keys to a VW Transporter 2019 MQB with Xhorse VVDI Key Tool Plus, generated two Xhorse XSDM04EN MQB smart remotes & read EEPROM, read immo, both saved , learned new keys using immo data.
All programmed fine; customer’s original remote works great. Two new XHorse remotes will not; tried learning again with no batteries and still no luck. Again, customer’s works fine , all 3 keys start perfectly
Any ideas on what may be wrong?

Here is the clue.

VW Transporter/Caddy 2019 is MQB4.5 not MQB49 5C.

Those keys are MQB style, not MQB electronics.

If MQB 4.5 you may need a different key profile and to learn remote manually (sometimes).

2019+ IMMO 4.5 VAG the remote channel 09 is locked and remote is learned during transponder programming. You need to use the aftermarket BH or DH ending serial keys with chips on board otherwise remote won’t program and you cannot access remote channel without ODIS.