Hello.
Most immobilizer systems have to be reset using a computer with specialist software as on the VW Beetle it has its own immobilizer module behind the key switch.
You can try the tips on the link below. If the VW tip below does not work you will need an auto locksmith with the correct equipment.
https://www.2carpros.com/articles/how-to-reset-a-security-system.
Hope this helps, please let us know your repair updates to aid other users in the future.
Many thanks,
Dave H
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Sunday, February 21st, 2021 AT 12:25 PM