I had a similar question when we bought a used Air Dream to replace one that was wrecked. I asked Lucid Customer Service if the remainder of the three years of free charging would transfer from my original car to the replacement car. They said I would be able to use the remaining free charging the was assigned to the used car I purchased, as the free charging is linked to the car's VIN in EA's database, not to the owner. I asked what would happen if I needed to call EA for assistance with a charging issue and they found out I wasn't the original purchaser of the car. Lucid told me that EA doesn't have the names of the car owners -- just the VIN's of the cars eligible for free charging.
If, however, you need to initiate a charging session using the Lucid app (I never have), Tim-in-CA is right about needing access to the Lucid account login information.