So, I need to forward my ISP SIP service from a Mikrotik hEX S to all connected devices. The authentication part would be done client side, both on a Computer and a Phone (Zoiper). I extracted the ...

Looks like you haven't told the PPPoE to go over your "Spark UFB" vlan interface. Go to PPP (left hand sidebar) -> the pppoe interface and set the "Interfaces" to "Spark UFB". In my screenshot ...

I have received my Orbi modem from 2degrees and attempted to set it up while my current ISP is still Spark, but I have not been successful in completing the setup. It seems to always stop at a certain ...