Connection works on private extended router, not Unifi router
With 3 devices (phone, laptop, tablet) on 3 connections (direct on unifi router, homeplug via unifi router, upstairs own router via unifi router) I get different internet access. With the least access on the unifi direct connection.
The thing is that in any scenario on any device e.g. YouTube works via chrome, not via the YouTube app. Or the homeplug works on tablet and not on laptop. Or Wikipedia first does not load but later does. Or it opens not on the homeplug and unifi, but does on the upstairs modem (that connects through the unifi router to internet). The router upstairs seems to always work, such issues especially exist with the unifi direct connection and the homeplug.