Unable to Share Computer Audio and Screen Simultaneously in Zoom Webinar

I am experiencing an issue with sharing both computer audio and screen simultaneously during a webinar session on Zoom.

Here are the details of the problem:

1. I am using a Zoom Webinar plan and hosting webinar sessions.
2. When I attempt to share my screen during the webinar, the "Share Sound" checkbox is visible but grayed out, making it impossible to enable sound sharing.
3. If I go to the "Advanced" tab in the screen sharing menu and choose "Computer Audio Only," the computer sound is shared successfully, but the screen is not shared.
4. This issue occurs on multiple PCs, not just mine, so it seems to be a broader issue rather than a device-specific one.
5. I have already checked the following:
   • My Zoom client is up to date.
   • The settings in my Zoom account on the web portal do not seem to provide any option to enable or disable computer audio sharing.
   • My computer's audio and microphone settings are configured correctly.
   • I am the host during the session, so permissions are not an issue.