Not sure but after assigning the license you may need to restart ArcGIS Pro. You can always check what you're licensed for in Pro. From the start page of the application, click About ArcGIS Pro in the bottom left corner. (If you're in a project, click the blue Project tab.) This takes you to the project page. In the list of options on the left, click Licensing. In the top box, you'll see whether you have a Basic, Standard, or Advanced license. (The one that's not grayed-out is yours.) In the next box, you'll see a list of extensions and whether you have a license for them or not.