iOS app testing. App installation failed. No code signature found [closed]

In my case, the problem was unsigned frameworks.

Xcode 11 or above:

Go to Build Phases, expand Embedded Frameworks and select all Code Sign on Copy checkboxes.

Xcode 10 or earlier:

Build Phases > Copy Files > Code Sign on Copy (select all checkboxes)

Code Sign on Copy selected in every row

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