Checkbox in cell, cell controls group, Insert menu

Hi,

W11 insider canary channel, v 23H2, (b 25982.1000).

M365 insider beta channel, v 2311, (b 17029.20000) checkboxes in cells missing.

I saw this feature was released on v 2310 (b 196924.2000).

Thanks a lot for any clue,

Liviu