Ignition lock mechanically broken – replacement lock from e.g. eBay?

Dear people I got ice cold today: There was never any “hooking” while turning the keys of my XC90 MJ06. Today I went to work, wanted to finish at the customer’s appointment and turning the key at position 1. In the forum looked for and tried various things. Seems to be actually a mechanical problem in the cylinder of the ignition lock, second key, wobble around, gentle violence while turning it did not. Question: What makes more sense (and I live in the country and far away from the next friend?) A: Order a new ignition lock at the friendly one? –> Does the immobiliser have to be re-learned from the workshop? B: Order used items, such as from here (and would the old transponder be sufficient?): https://www.ebay.de/itm/224777516420?… Is the exchange possible through a medium gifted screwdriver? Thank you for your feedback!