Hi,
You will need to work with your account team to acquire a license for SnapCenter.
They will need to order a $0 trial license.
As a reminder, the SnapCenter Standard capacity based license is only needed for ONTAP Cloud and ONTAP Select systems.
If you as using a FAS or AFF then you need a different license - The SnapManagerSuite trial license.
If you are already using a SnapManager product that is licenses at the controller (not the host) level, which uses the SnapManagerSuite license, then you already fully licensed for SnapCenter Standard on FAS and AFF platforms.
Hope this helps,
John