network settings: Check domain part in outer (anonymous) identity of WPA2 TTLS/PEAP settings
Using an outer/anonymous identity is normally needed if you are in different realms(?). For example, logging in over the Wifi of another university with Eduroam. That university network needs to know where to send the request to, and, therefore, the domain is needed.
Can the settings dialog show a warning, if no domain is entered? That would help a lot, as I recently did the same mistake forgetting to enter the domain part.