I’m trying to add new Responders and I get this error warning

This happens because the Responder registered their phone through the app, before you could add them to your Data Center, and they are now in a generic data center called Registration.
The best way to avoid this from happening is to add your Responders to the website before they register their phones through the mobile app.
To resolve this please send us an email to [email protected] with the Responder’s Name and Phone Number, and the name of your Agency account