How to sign my panel plugin?

I tried to follow this guide: Sign a plugin | Grafana Plugin Tools to sign a private plugin but I ran into issues.

At the cloud access policies I can not find the plugin:write scope described in the guide and when I try to sign my plugin I get the error message

sign-plugin@3.2.0  Error signing manifest.

Server responded with status code 403 along with:
• code: Forbidden
• message: You do not have permission to perform the requested action.

which is probably because i don’t have the correct scope selected to perform the signing. What do I have to select / how to fix this?