during a game on the app, 2 players i have upgraded a city. the game continued . then came my turn to upgrade anothr one. i had enough resources to allow to upgrafe. the screen had blinking circles for building knights but when i tried selecting the settlement to upgarde it didn’t respond. i lost my turn due to time pass and retried several rounds. placing a knight was possible but didn’t reset the ability to upgrade. building road was possible too.
after realizing this was a bug i restered the app and reconnected. it didn’t help.
i had lots of ore and wheat. then i closed ghe app and connected through browser. same thing. no ability to upgrade a city.
finaily i lost the game.