Subsite not showing up in Admin panel.

I added a site to my multisite and received errors. The errors are from the MailChimp plugin not having the API key entered. I have since entered in my API key.

Now, I can get to the sub site by going through the subdomain wp-admin. No problem. However, the sub site does not appear in my Network Admin drop down of sites to manage.

Thoughts on how to correct?

Regards,

Martin