Mobile game does not work with mobile data?

For me, all apps etc. Work when I have the mobile data on. Games that need a network connection etc., but a certain game that used to work is no longer possible. In the settings of my Huawei P30 Lite I have set that mobile data should be activated for the game, but nothing loads as soon as I open the app. I wanted to ask if anyone knows why this could be and what can be done about it?

Maybe because of the low speed of mobile data.

Have 4g and enough data volume.

4g should be more than enough, even 3g is normally enough

Which game is it?

If you are sure that the internet connection is not the problem, your provider could be blocking the connection.

Have you ever uninstalled and reinstalled the game / app?

Yes, I uninstalled and installed it 2 times.

Some games insist on Wi-Fi, they just don't want mobile data.

I used to be able to play the game with mobile data. : /

An update can also come and it no longer works.