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Event ID: 2005 Source: MSExchangeCertificateDeployment

Level
Description
Federation or Auth certificate not found: 0A37B5E56D877738672378CE9B6643325C498184. Unable to find the certificate in the local or neighboring sites. Confirm that the certificate is available in your topology and if necessary reset the certificate on the Federation Trust to a valid certificate using Set-FederationTrust or Set-AuthConfig.  The certificate may take time to propagate to the local or neighboring sites.
Comments
 
EV100589 (Missing the "Microsoft Exchange Server Auth Certificate") links to a discussion related to a similar issue with some advice on how to fix it.

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