SSL switch http to https

I’m not 100% sure I fully understand what you are trying to do or how your setup is cofigured, but you might want to try and take a look at these to see if they might provide some further insight into exactly what you are trying to acheive?

http://www.wpbeginner.com/wp-tutorials/how-to-add-ssl-and-https-in-wordpress/

https://wordpress.org/support/topic/multisite-domain-mapping-ssl?replies=23

Hope this helps.