So, I feel stupid asking, but....

You can make the primary taskbar (with the clock) appear on all monitors, but this also duplicates all your taskbar icons.

Right-click on an empty area of your taskbar and select Taskbar settings.

In the settings window, scroll down to the Taskbar behaviors section to expand it.

Look for the option that says Show my taskbar on all displays and toggle it ON.

Hi,

to my knowledge, this should be possible:

Using Windows 11 built-in (22H2 and newer):
Update to Windows 11 22H2 or later → right-click the taskbar → Taskbar settings → expand Taskbar behaviors → enable “Show my taskbar on all displays.” The clock will appear on every monitor automatically.

Using ElevenClock (as you have it in your screenshot - sorry I cannot see more due to resolution):
If it does not show up on your second monitor, right-click the ElevenClock clock → ElevenClock Settings → under Clock Settings, make sure “Show clock on secondary monitors” is enabled. If you also want to replace the system clock on your main screen, tick “Replace system clock on the primary monitor.”