IOS packaging error The Legacy Build System will be removed in a future release. You can configure the selected build system and this deprecation message in File > Workspace Settings

I find it!!!

!!!If you join unrealengine’s Github!!!

https://github.com/EpicGames/UnrealEngine/commit/ed97f0f865b7dce3c43bb15c2d7f86974eaafd75#diff-984b1fd9bd2159102721f49c0fd8fbfb8a8d1cfc8075b79e8bcf9802581b2f5b

https://github.com/EpicGames/UnrealEngine/commit/0872cfbd11a73fe44a0e268eb46cfef4d61cda92#diff-984b1fd9bd2159102721f49c0fd8fbfb8a8d1cfc8075b79e8bcf9802581b2f5b

https://github.com/EpicGames/UnrealEngine/commit/dc7a584238fe265eac323fd8b74806f821fcd7f9#diff-984b1fd9bd2159102721f49c0fd8fbfb8a8d1cfc8075b79e8bcf9802581b2f5b

PS:4.27 has solved it.

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