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Certificate error in Autodicover
Certificate error in Autodicover already installed certificate in trusted root but error perists Any known issue?
That's because your firewall (Sophos) is performing SSL inspection and basically replacing the certificate. You need to make sure the firewall cert is trusted as well. Read here: https://community.sophos.com/kb/en-us/123048
Similar Sophos post detailing how to push the HTTPS cert out via group policy: https://community.sophos.com/kb/en-us/42153