What's going on, @TeamYouTube?pic.twitter.com/Z4HxQyzgDX
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
This is happening on my iPhone X. The service is working on my desktop computer.
Have you tried signing out and signing back in? Also, try rebooting your device or uninstalling and reinstalling the app. Keep us posted.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.