Government Employee and Private Goods

When is it ok for a government employee to talk about their private goods on national television. According to an article title" White House says Conway has been 'counseled' after touting Ivanka Trump's products" this article is from the washingtonpost ..On how the president's official counselor use national television to advertise Ivanka Trump business. What I like about the article is that it talks about how executive branch employees and armed forces cannot use their public office for private gain. I think this is interesting because apparently, they thought it was ok to advertise using their public office title. I think is important to read and learn the facts about how the system works when it comes to private goods own by government officials. If we are not well informed, we might not see something wrong with a government official doing this for personal gain.