Whenever I sign in witht he wizard, it says “There is no license for Harmony Essentials in your account” but I have purchased a Harmony Essentials Desktop Subscription Monthly Desktop. Please check the screenshot for proof. I have purchaseed a license and would like to use the product 
It’s not something any of us can help with. Send a letter to support about licensing issues:
https://store.toonboom.com/contact/support
Judging by the screenshot, your license appears to already be installed.
If you changed any of the system’s hardware, the license may need to be
repaired.
Open the license wizard from the “License Tools” folder
of the software using the options:
Manage Licenses
Manage Local License
select the license if it’s text is grey and hit the “Repair” button.