If I embed tweets on this blog I usually just paste in the url to the tweet and it auto-magically embeds.
This page,Twitter Embeds — Support — WordPress.com came to the rescue
[tweet https://twitter.com/lewiswake/status/1155162973683556352 hide_thread='true']
gives a nice single tweet.
NB, for Scottish educators, this is not true for Glow Blogs at the moment. I suspect due to our version of Jetpack?