Tagged port not working

[SammyPlex]

I have a 2 switches both directly connected to the router. 1 switch is POE and other is not.

When on the POE switch i change a port to be tagged it stops working means device on that port will not get an IP address. All ports are on VLAN1. This is a managed switch. I have a NTU, phones and workstations plugged into this. Phones need to on a tagged port so NTU can do the job.

My second question is i have been asked to put NTU in VLAN 10 and keep phones in VLAN1 , then service provider will push the configuration to the phones. Will phones be able to talk to NTU(Which on a different VLAN) just making the ports tag the traffic.

POE switch is netgear

[schumaku]

Not just the phone port needs access to the VLAN, also the uplink port to the router must be configured accordingly.