Please confirm we understand correctly: you had purchased X on Envato, has a Paypal receipt but no license is displayed in your Envato list, right?
If this is the case, you need to check first with Envato. They probably haven't added the license to your account yet.
But, if you mean that you don't see the license on our side (Licenses page: https://theme.co/apex/licenses), remember you need to register using the purchase code like explained in our Knowledge Base: https://theme.co/apex/forum/t/setup-product-validation/55. You have already registered other licenses, so you're possibly aware of this step, but this is just a remembering.
Please let us know if you can solve this issue with this info.