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I assume you have a 2-tier internal PKI that signed your Exchange cert - a root and intermediary. Ensure both are uploaded to the trusted certs in the SEG section in the UAG.
thanks for the Input, crt or pem file format?
CRT and PEM are both technically base-64. When you open up with a text editor, you should see it say BEGIN CERTIFICATE and END CERTIFICATE between the certificate content. If you see a bunch of non-ASCII characters, it’s likely DER format which will not work. It likely won’t even let you upload.
Will test it out, thank you a lot.