If you can tele-work from country A then I see no reason you cannot work from country B unless it is subject to US export control restrictions and your job deal

If you can tele-work from country A then I see no reason you cannot work from country B unless it is subject to US export control restrictions and your job deals with such matters. You/your lawyer may also want to look at any tax/banking/financial restrictions that the US may have placed on country B as it could affect salary reaching your account. Even more so if you are a US citizen.