Just found out that the organization also has an Android endpoint WITHOUT two-factor authentication... (well, could be the endpoint works for other OS as well) Tried that as OWA url in davmail and it worked. Until they add additional security to it, it worked with https://eas.intility.no/owa Perhaps this finding could be of help for others whose organizations do something like this and do support android clients: try and look in the android email settings and copy that to the OWA URL ;)
Two factor authentication on EWS
there's an easy workaround: View -> One page. Cool I'll try that. It's still a bug...