The "play sound on startup" option is not available

Hello, VanMacuser84.

Are you having trouble with your startup chime?

What model year is your Mac?

Turn the Mac startup sound on or off - Apple Support:

https://support.apple.com/en-us/HT211996

That is an option only available in macOS Big Sur.

In Catalina the option must be set with the Terminal application.

To enable the startup chime start Terminal and enter:

sudo nvram StartupMute=%00

you will be asked to enter your admin password.

To disable the startup chime start Terminal and enter:

sudo nvram StartupMute=%01

you will be asked to enter your admin password.

Hope this helps.

It is only available on certain Macs. Yours may not be one of those.

I don't know which models it applies to, though.