I have figured out the requirements to complete the thing that pops up at the start if you didn't already do it:
1- In the first slot you must have a name written in Chinese with 3 random (letters of the Chinese language)
2-In the second slot you must enter a randomly generated ID code (refering from above in this post)
Once you have clear both 1 and 2 you should be able to play the game (well I know that it did work for me and some other people)
You can go to this customer service page of MF
https://moefantasy.kf5.com/hc/request/guest/
or just contact cs@moefantasy.com
You just need to told them that you are not in China, and you do not have the ID code in China.
And then they will help you to verified your account.
This was a recent update. There are now a total of 8 fleets. Fleets 5-8 can only be used for expeditions while only fleets 1-4 are sortieable.