Hey there,
By default, your users will receive superuser
privileges so any reserved connections that may be allocated are likely in-use.
That being said, you may need to issue a restart to clear those connections.
Once you have cleared some connections, you could consider bumping your max-connections
to something more appropriate for your use-case.
More information about this can be found here: Postgres config management is now available!
Let me know how that goes!