E450 Poly Edge phone is provisioned for Google Voice for Workspace. The headset is a Jabra Engage 75SE, and I’m using a Jabra Link 14201-17 EHS cable. I’m pretty sure I have the Jabra set up correctly, using the settings from Jabra’s website (DHSG EHS mode, volume 6, Dial Tone Switch A). However, when I try to change the headset settings on the E450 phone on the Settings>Basic>Preferences>Headset>Hookswitch Mode page from “Regular Mode” to “Jabra EHS” and reboot the phone (as required), it goes back to “Regular Mode” no matter what I try.