Multisite

Hi I am new to Multisite but have managed to get it up and running I am now trying to set up additional path on my site for new sites which appears to work fine i.e it shows up in my sites section and sends the necessary login info by email which works to login but I am unable to access the dashboards on any of my new sites the error message is Firefox has detected that the server is redirecting the request for this address in a way that will never complete. Can you help me to resolve this the dashboard isn’t accessible for the sites as the super admin either

Thank you