When activating Dashboard Server you see:
"License already activated"
"Maximum activations reached"
Activation keys are normally valid for a limited number of activations.
Your Primary license key can only be activated once. Your Primary license should be used on the first server in your production environment.
If you are adding further SquaredUp servers to a multi-server / high availability environment you should use the Secondary license key for each subsequent server (see Enabling High Availability). The Primary license should only be used for the first server in the deployment.
If you are using your v3 activation key on v4, please see How to migrate from Dashboard Server SCOM Edition v3 to v4 for how to proceed.
If you uninstall and reinstall on the same server and you originally carried out an offline activation (as described in How to activate your license offline (manual activation))then you can reuse the same .bin file by browsing to http://SquaredUpServer/SquaredUpv5/InstallLicense (where SquaredUpServer is the name of the server where Dashboard Server is installed). The .bin file cannot be used on a different server.
If you need any help please contact SquaredUp Support with the activation key.