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With the error message "the certificate used for s2s authentication is not installed", we can see that your D365 server does not seem to be able to successfully connect to Exchange Online
stackoverflow.com/.../certificate-used-for-s2s-authentication-of-dynamics-365-for-customer-engagement
Please see responses from this thread. This will help.
community.dynamics.com/.../ribbon-missing-in-email-server-profile
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