Hi @Larsonhenrik , I’d be more concerned that your used device isn’t still claimed on another Org dashboard. Have you been able to add the AP to your own Meraki Org and Networks?
With regards setting the AP up. Once you’ve added to your dashboard simply fire up and configure an SSID based on your requirements.
MR QuickStart guide to help you on your way
https://documentation.meraki.com/MR/MR_Quick_Start
Darren OConnor | doconnor@resalire.co.uk
https://www.linkedin.com/in/darrenoconnor/
I'm not an employee of Cisco/Meraki. My posts are based on Meraki best practice and what has worked for me in the field.