Claiming Generic Node SE via QR

As a happy fresh GNSE owner I tried to claim the device (as instructed) via the dedicated host Generic Node Device Claiming Server
following the instructions at Claim a Device | The Things Stack for LoRaWAN

After registering it is not yet possible to set up an application and add/claim the node.

My question is : how will I know when this host is fully operational and the claim procedure will be available? I would like to test this.

Thank you,