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Is your situation similar to mine? I described my situation in Question "SageMath-9.0 authentication error". Your situation is closer to the one in Question "Sage 9.0 installation issues on macOS 10.15.2 Catalina". It might be different version of OS causing different appearance of trouble. If you try the terminal command "codesign --verify /Applications/SageMath-9.0.app" and the result turns out similar, one of the solutions described in these two Questions/comments will be applicable.
