Hello @Mandy-and-Martin0,
That is technically not allowed. You can call the company and have them cancel the reservation because of this. Do not cancel it yourself. You will be penalized. You would likely be forgiven the penaties since this is a legitimate reason, but it would be headache. Just call, and they will take care of it.
Even though it is against the rules, people do this regularly. Often, people might book, say, for their parents, who might not have an account. Sometimes I go with it, sometimes not. The fact that you are uneasy in other ways makes it clear that these people should not be coming.