Add key to secure element fails

I’m trying to add a key to the secure element as described in https://developer.parrot.com/docs/airsdk/general/security.html#security-add-key. However, it fails with the following error:

> ./build/dragon_buildext_mission/manage_keys.py --add-key fm-provider-public-key.pem --drone-address 192.168.42.86
INFO:root:Retrieving drone serial number
INFO:root:-> PI040450AA1K001871
INFO:root:Creating temporary APC user and authentication token
INFO:root:Generating challenge
INFO:root:Sending challenge to drone
INFO:root:Completing operation with drone response
ERROR:root:Exception occured: 403 Client Error: Forbidden for url: https://academy.parrot.com/apiv1/4g/secrets?message=*(...removed encoded message...)*

Is it necessary to do anything else for that command to work?

I tried the command from a new setup/computer and I get the same result.
Is there any authorization from the Anafi AI necessary?