Hello SofieCora,
Thanks for reaching Microsoft Community. We're sorry to hear about this issue on your device and pen. We'll do our best to help.
May I know what model your Surface device is? See Find out which Surface model you have (microsoft.com) for more info.
In the meantime, to know if you have admin rights on your device, please go to Settings then click on the Accounts. Under Accounts section, you will Your Info on the right panel. Check whether it's logged in with an administrator account or not.
Regarding your pen location, kindly check this thread similar to your concern and see if it helps: Surface Pen Find My Device No Location data available Unavailable or - Microsoft Community
Best regards,
StevenK