Split Sleeper Confusion with Company Regulations

Hello, everyone. I am constantly reading here but barely post. However this one has completely stumped me and there is zero information on Google at all about it (no matter how I phrase it, all I get are tutorials on how to split a clock).

I am very experienced in how to properly use split sleeper, and it has saved me many-a-time when sitting at a dock burning off my 14. The split has consistently allowed me to rest during that time, pause my 14, and be able to be stres free about moving on after getting loaded. It has also saved me when dealing with inclement weather.

My reason for the post is a question. Can a company block a driver from using split sleeper? I just switched companies and found out they do not allow their drivers to use any split sleeper capabilities. I understand companies having leeway on personal conveyance, but I thought split sleeper was supposed to be something all drivers had access to as long as they are in a qualified sleeper truck, which I am, and on qualified HoS rules, which I also am (70 hour standard).

Anyone out there, can you lead me to any actual regulations that confirm or deny if a company can prevent drivers from using split sleeper?

Thank you, all, and as always stay safe out there.