Yes, the copyright owner cannot prevent the licensee from selling the license, but the copyright owner also does not have any obligation to continue hosting a cloud service, to authenticate the existing license on a different account using their cloud service, or to otherwise assist the licensee in transferring the license.
But they might be under an obligation to not build licensing infrastructure into their software that bound licenses to accounts in the first place, in a way that technically prevented users from transferring them. That could be seen as a form of DRM restricting users from reselling something they're legally able to re-sell, and the courts would Not Like That, for the same reason they don't like things like warranties not transferring on resale.
