We require shared line as the primary line

We require shared line as the primary line in Webex Calling

We are moving from a CUCM to Webex Calling, we have multiple users who share the same number on CUCM, so we need this in Webex Calling, it appears when using the softphone and deskphone that we cannot assign the same number as the primary number, it only lets us add it as a secondary number which means we have to use dummy numbers as the primary, we do not want to do this and want the same number on different users as the primary.