When adding Aria operations license key under License management receive an error "The following license keys are not valid, expired, or already exist and must be removed from your input before you can continue"
Environment
Aria Operations 8.18.x
Cause
In 8.18.x , the VMware Aria Operations licensing has been moved under Legacy Licensing. There is a new option called License Management under subscriptions where you can add VMware Cloud Foundation Solution License keys, VMware vSphere Foundation Solution License keys, and vSAN licenses.
Resolution
Sign into the Aria Operations UI with an admin user
Expand the panel in the left hand side
Expand Subscriptions
Click on Legacy Licenses
Click on ADD
Select vRealize Operations
Enter in the Aria Suite License keys you have click on Validate