@waterresistro , For the error code 403, it means forbidden, access denied. Please check if the account we login Microsoft Endpoint Manager admin center is with Azure AD Global administrator or Intune service administrator rights.
https://learn.microsoft.com/en-us/mem/intune/fundamentals/mdm-authority-set
If there's anything unclear, feel free to let us know.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.