I have a WP site that uses gravity forms and the user registration add on using the email address as the username. Once I added the multisite, the site kept returning validation errors ie no capitals, email already exists etc.
I need to find a solution to this issue.
Arnav Joy answers:
this problem comes when you use , normal username instead of emails?
Mathew Moxness comments:
the problem happens on any input that I also assign to be the username. so if i choose email as the user name then it gives a validation error or if i choose company name it also gives a validation error.
This plugin has helped me to override e-mail restrictions on my Wordpress Multisite.
(altouh not updated for a long time, it still works like a charm!)
Network activate the plugin for proper usage.