Google Play Services Permission required
Prior to first time opening waze you need to ensure that 'Google Play Services' has permission to access 'Phone'. If 'Google Play Services' doesn't have access to 'Phone' then waze will skip the start screen (and thus you won't have accepted the t&c's) and you won't see a map (it will be a blank map) and the guest account will not be properly initiated. You won't receive any error messages and the waze app will act up.
Thanks for reaching out. Please note this platform is dedicated to ideas and suggestions for the Waze app. If your idea is for a Community platform like the Waze Map Editor, please submit it through the Community forum. If you need help using Waze, please click here to reach the "Waze support" page.