Because Prota is a personal smart hub, you can access it only with devices that have been granted the access.
If it is the device that you have done the first time configuration with, Prota automatically authorizes the device.
If you want to use Prota space on a different device, you need to access to your Prota with the access link that you have received during the first time configuration. Or you can send an invitation link to authorize the other devices.
But please not that the 'invitation access link' has a limited authority. ( You can't install/delete apps, upgrade Prota software etc.)
If the problem persists, please contact Naran Support team at support.prota.info and send us your Prota ID and access link. We will help you to resolve the problem.