Hello 吉田知那美,
There are no issues with IOS 17.4.1 on FlyOrDie. 
(It was released on March 25, 2024. Many players have been using it since then)

Please clear your broswser's cache and restart your device.
Or try to connect using a different browser.

If this does not resolve the issue, please read the FAQs which contain more useful tips  -->

https://www.flyordie.com/games/help/support/contents.html

  before contacting FlyOrDie's technical support  
--> 

https://games.flyordie.com/s/contactSupport.html?portal=flyordie_com&lang=en

 
Pls. allow them a few days to get back to you.

Kind regards,
John