The government is obligated to issue and have the license plate delivered. They have met the obligation of issuing it, that isn't in question.

The government then has a contract with PostNord to deliver the plates, and the contract says it must be delivered, and cannot be picked up in person.

Tesla is going to argue that this restriction preventing pick up in person isn't lawful.

They aren't asking for special treatment saying ONLY Tesla should be able to pick the plates up in person, they are asking for the same treatment for everyone. That everyone should be able to pick them up in person, at least in a situation like this.

And again - the judges have already agreed there is merit to their argument and allowed Tesla to pick up the plates in person, and have imposed a fine if they are prevented.

Another rationale if I understand this properly (and I might not, so the below might be wrong)

My knowledge of the whole force majeure side of the strikes is pretty bare, but my understanding is the strikes are being treated as force majeure. The government also needs to be able to function if a force majeure event occurs. In this case, the government is unable to meet its obligation to have plates delivered in the event of a force majeure, which doesn't have to be a strike, it could be other things that impact the postal service to. So it's possible that this contract needs to be ammended to account for force majeure