Api key for multiple organizations - cannot find "Link More Organizations"

I am trying to create an api key for multiple organizations, following this guide:

but I have no option for “Link More Organizations” in billing, I am currently on the developer plan.
is this plan sufficient? is linking done in an other way?

Sounds like this is a support plan (my interpretation), in which case I’d recommend creating a support case so that the Atlas support team can assist you out in this one