1. Launch the Exchange Management Shell (EMS)
Click on the start button and expand Microsoft Exchange 2016 and right click on Exchange Management Shell and run as admininistrator.
2. Run command to view status
Run the following commmand to check the status of the changepassword option: Get-OwaVirtualDirectory -Server Ex2016A | fl Change*
3. Run command to change status
Run the command to disable the changepassword option in OWA: Get-OwaVirtualDirectory -Server Ex2016A | Set-OwaVirtualDirectory -ChangePasswordEnabled $false