Hello @Hellesvik, Sigurd !
Welcome to Microsoft QnA !
It seems that you have Azure Policy in Place that prevents the creation of IOT Hubs on your Subscription
To fix that contact the Administrator to open the ablity, by removing the Deny Policy
If you are the Administrator please find the Azure Policy menu and seach for the assignments that are active on your Subscription
You will find the setting .
Change or delete it
https://learn.microsoft.com/en-us/azure/governance/policy/overview
Please send your feedback if you need additional help
I hope this helps!
Kindly mark the answer as Accepted and Upvote in case it helped!
Regards