"Resource not accessible by personal access token" when adding new collaborators on a repo

[tomorrowdevsit]

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I'm wondering which kind of permission I've to set in order to add new collaborators on a Repo through API calls.

I've successfully created an organization Repo, using a fine-grained personal access token configured with Administrations permissions.
After that I would like to invite some collaborators, but the API fails with the error "Resource not accessible by personal access token".

The API returns:
x-accepted-github-permissions: administration=write
which identifies the need of an Administration permission, which I've already set on the above mentioned token.

What should be the right setting for that?

Thanks a lot

[tomorrowdevsit]

I've also double checked here if I was missing something, but apparently everything has been set correctly, so I'm wondering what's wrong.
I'm using this endpoint: PUT /repos/{owner}/{repo}/collaborators/{username}

[fpflabs]

I have encountered the same problem , did you find a solution?