How do I get WPMUdev to work after changing to multi site

Hi, thank you for your help.

I just changed my single site to multi site. Then reactivated wpmu dev plugin on network dashboard. Followed prompts to enable my domain name without the "www" but still get a message saying "you have reached your maximum number enabled sites fro one click installations. Can someone please help with this? I was tryign to install the multi-domain plugin.

Thank you.