Delete one Key Fob or delete all and re add?

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Rollerbones

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Got a used 2021 Tahoe that came with one key fob. Had a new one made for it but it is considered "Key Fob 3" so I can't save seat position#2 to it.

How can I delete the old Key Fob that is missing so I can set my #2 profile?

I do have a TechLine Connect account for my VIN and J2534 Bosch Mastertech II interface.
If I go into immobilizer module it seems I would have to delete ALL fobs and only program the 2 (no way to delete just one),

I want to make sure I can do this before deleting them out and not sure how/if I can re add. Does anyone have instructions for something like this?
 
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