Can Embedded Timelines be Shown?

The twitter Developers site has instructions for embedding a timeline into a website but it doesn’t work. All that shows is “Tweets by accountname” in some browsers (Firefox, Edge, Safari) or “Nothing to see here – yet
When they Tweet, their Tweets will show up here.” in other browsers such as Opera. Even in their instructions page at https://developer.twitter.com/en/docs/twitter-for-websites/timelines/overview it displays “Tweets by TweetDev” instead of their embedded timeline. I got a Bearer Token for this plugin but is there a feature in this plugin that will let me display an embedded timeline for my account in my website? Or do I need to get the Pro version for this? Will the Pro version show my embedded timeline in my website?