From the manual:
Ownership and identity accreditation Become primary user To become a main user and thus prove ownership of the vehicle, you need both of the vehicle’s physical keys. Ownership accreditation takes place in the vehicle during registration or, if you already have a CUPRA CONNECT user account, you must log in through the infotainment system and then go to Manage users
● Switch on the ignition and the infotainment system.
● In the infotainment system, register in CUPRA CONNECT.
● Or: open the menu Manage users > Settings > Become primary user and follow the instructions.
● Press the unlock button on the first vehicle key.
● Press the unlock button on the second vehicle key.
Once the infotainment system has processed the orders by radiofrequency, the accreditation of the ownership will have been completed. You can control the current status on the CUPRA CONNECT website. How is ownership accredited? Infotainment 2-Key method. CUPRA CONNECT website No, it is not possible CUPRA CONNECT application No, it is not possible Identity accreditation (SEAT Ident) Identity accreditation must be completed before you can use CUPRA CONNECT services that are relevant to security, such as the 174 Data transfer “Remote Opening” service. Identity accreditation is done at the specialised CUPRA dealer or any SEAT dealership. You can find more information about SEAT Ident on the CUPRA CONNECT website at myCUPRA.com.