Not sure what you mean by "it works now". It isn't that it is working or not working. It's that the path to get to it has changed and I don't know what the new path is.
Your directions say to go to Sell On eBay > Configuration > eBay Account >General TAB, click on the Get Token Button.
But Sell on Ebay no longer exists since Ebay implemented the new seller hub.
More about the new seller hub here: https://www.ebayinc.com/stories/news/ebays-seller-hub-now-live-for-all-u-s-sellers/
You need to familiarize yourself with the new seller hub as it's here to stay.