The below troubleshooting guide can help you when your email stops working on your iPhone.  Troubleshooting Step 1: On your iPhone, please click Settings go to Mail,  go Accounts and select the account in question.  It should give you a prompt requesting authorization.  Please follow the instructions shown.

This article runs through the steps of Resetting a Polycom phones admin password. 1.) Power down the phone 2.) Power up the phone and when it shows "Loading Application", or "Starting Application" hit the Cancel button. 3.) Press and hold 1, 3, and 5 on the 10 seconds of the autoboot screen until the "Enter Password: ___ to Reset Settings screen shows up. 4.) Type in the Mac address of the Polycom phone as the password (This is displayed underneath the phone usually starting with 6416. 5.) This will bring up the screen to reset the password. 6.) in the "Old Password" type in the Mac address from step 4. 7.) Type in the password in the "New Password".

This can happen when trying to change the admin password back to its default. 1.) Turn the phone off 2.) Turn the phone back on and when it shows "Loading Application", or "Starting Application" hit the Cancel button. 3.) Press the "Setup" within 10 seconds of the autoboot screen 4.) Enter the admin password; this can be 456, 789, or 8675309, if none of these passwords work you will have to reset the admin password first. 5.) Go to the bottom and Select "Reset to Defaults" and then click "Reset Settings" the phone will reboot 6.) Follow Steps 1-3 and Select "Reset to Defaults" and then click "Format File System" the phone will reboot 7.) Follow Steps 1-3 and Select "Provisioning Server:" 8.) Select "DHCP Menu" 9.) Set "Boot server:" to "Static" and click Exit 10.) Edit "Server type" and Select "HTTPS" 11.) Edit "Server Address" to display the correct Server; "*" will type a "." and "#" will type a "/". (For Ex. Zoom Polycom VVX450 phone is: provpp.zoom.us/api/v2/pbx/provisioning/Polycom/vvx450) (This can be found in Zoom admin portal) 12.) Select "OK", then "Exit" twice, and "Save & Reboot"