I cannot fetch emails from exchange mailbox

I cannot fetch emails from exchange mailbox

I cannot fetch emails from exchange mailbox. I get this error below


FAILURE :E-mail settings saved successfully. Could not find valid certification path to requested target, so kindly configure to apply Trusted/Self Signed Certificate.


Am using Excghange 2013
SQL 2014
My Service desk is version  9.4 Build  9402


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