Shipper and WPMU DEV not working.

The WPMU DEV Dashboard is not showing on this site.

And if we try to access Shipper settings from Plugins page /wp-admin/admin.php?page=shipper-settings we get:
Non hai il permesso di accedere a questa pagina.

We ran a plugin and theme conflict but ended up with the same issue even with only the dev dashboard and shipper active.

We spotted the issue when attempting to migrate one site to the other as Shipper said that the source site was not connected which is the one causing the issue and connected to the Hub.

Thanks in advance!