Save button may be gray out avoiding configuration changes to be performed from MIST UI due to incorrect port profile configuration

Below error may show up in switch dashboard MIST UI:

"test : These port profiles have the same VoIP and port network"

You should check the port profile in question ("test" in this case), and change the vlan so that it is different. Port Network (Untagged/Native VLAN and VoIP Network cannot be the same):