Turn off and on, it works fine But this is still problem with many people using SIGN IN WITH APPLE JS, because it has many bug in ios 14.5 and 14.5.1 ios 14.5.1 is released because of 14.5's many error but still it have many bugs Try in iPad 14.5.1 , it still not working

한국사람이신가요?? i also have same issue in 14.5 version my log is that [SOAuthorizationCore] canceling now - no SPI authorization delegate