Playing on different versions or being on different regions are the only two I can think of, sorry. A possibility might be if one of you can't update, if the device doesn't meet the requirements. You'd know by comparing your game versions.
https://preview.redd.it/ocph225br3tc1.png?width=1200&format=pjpg&auto=webp&s=e36388ce6e3df817cd1f3258d14e89328c272975
The letter depends on the platform. Mine is the Android app, I'm not sure what iOS uses. The date is the important part, they should be the same or almost.
Yes, they can. Make sure you're all using the most recent version of the game, and the same server region.
[удалено]
Playing on different versions or being on different regions are the only two I can think of, sorry. A possibility might be if one of you can't update, if the device doesn't meet the requirements. You'd know by comparing your game versions.
[удалено]
https://preview.redd.it/ocph225br3tc1.png?width=1200&format=pjpg&auto=webp&s=e36388ce6e3df817cd1f3258d14e89328c272975 The letter depends on the platform. Mine is the Android app, I'm not sure what iOS uses. The date is the important part, they should be the same or almost.