Custom properties API - admin rights needed?

[leherv]

Select Topic Area

Question

Body

I want to use custom properties on my repositories to be able to automatically (via github api) and manually (workflow trigger) set the tag to deploy in. Once for STAG and once for PROD (2 custom properties). This allows me to use the webhook feature to trigger deployments to x different targets decoupled from the pipeline code.
This would already work except for a permission problem.
I created a fine grained access token on my machine user and set the organization as the owner. The token has all the necessary permissions (i even tried with ALL permissions) and the machine user has write access to alle repositories in the organization.
If i try to update a custom property via the github API (does not matter if postman or curl inside the pipeline) i get the following response:

{
    "message": "Resource not accessible by personal access token",
    "documentation_url": "https://docs.github.com/rest/repos/custom-properties#create-or-update-custom-property-values-for-a-repository",
    "status": "403"
}

It only works if i grant admin access to the machine user on the repository i want to set the custom property. Does anyone experience the same? Is there a solution? I do not want to give admin rights to my machine user.