I went to create a new license file for our beta environment by following the instructions on this page: https://enterprise.arcgis.com/en/portal/10.7/administer/windows/obtain-portal-license.htm
But I was unable to create the file because it said I had 0 available Creator license types (out of 100), and the option to specify how many Creators I wanted was grayed out. My understanding from the documentation is that I should be able to draw from my currently authorized pool of licenses and just overwrite the number that is currently authorized. I have the full 100 users "claimed", but I thought when I went to generate the license file, I could just say that I still wanted those users plus whatever I wanted to add.
The option to generate a new license file is available when choosing a different version of Portal. However, I am not upgrading to 10.8.1, I am just trying to provision more viewer types for 10.7.1 (our currently version).