When a customer attempts to send an invitation to a new account they're met with a 500 or a redirect to another region that doesn't appear to send the invitation through. Collecting a .har file can confirm the 500 http error which typically happens on a variation of this URL:
"GET https://carbonblack.io/api/pub/v1/servers/cbio-ftw.my.cbcloud.de/invites". Instead it should redirect to "https://cbcloud.de/api/pub/v1/servers/cbio-ftw.my.cbcloud.de/invites".