Very likely related to the Lodestone post.

"While it is possible to create characters on these Worlds after the maintenance on June 18, Spriggan and Twintania will not be listed on the Data Center Selection screen until after the release of patch 5.0.
* Updated 18/6/2019 13:00 "

https://eu.finalfantasyxiv.com/lodes...20b0d5816401ea