have a look under your build settings, check that the setting Build Active Architecture Only
is set to No
(might make compiling a bit slower but should fix the problem)
Also check that the Valid Architectures
has arm64 in the list
Note if you are getting an error when submitting an app saying "Apps that include an arm64 architecture are required to include both armv7 and armv7s architectures”, setting it to No will also fix this
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