Dear respected sjk9,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
I’m sorry you’re having a problem but based on your description we can work together to resolve it.
For the situation you encountered, we deeply understand the inconvenience caused and apologize for it.
As per your description, based on my test with different machine, it available with a same version of Excel. For your reference:
Since it doesn't appear from your side as well, and I suspect, Microsoft still rolling this feature. As in some Office 365 subscription plan, the option "Checkbox" appears, and some Office 365 subscription plan doesn't.
Please understand that our initial reply may not always immediately resolve the issue. However, with your help and more detailed information, we can work together to find a solution.
I'm sorry and I apologize for that.
Appreciate your patience and understanding and thank you for your time and cooperation.
Sincerely,
Waqas Muhammad