When testing the Outlook Anywhere configuration using the Exchange Remote Connectivity Analyzers (ExRCA) you might encounter the following error message:
Autodiscover settings for Outlook Anywhere are being validated.
ExRCA wasn’t able to validate Outlook Anywhere Autodiscover settings.
The AuthPackage wasn’t specified in the EXPR section of the Autodiscover response.

If you encounter this error, you need to verify the following two attributes of the Outlook Provider configuration:
- Server attribute
- CertPrincipalName attribute
Server Attribute
Remove any dedicated server configuration.
Get-OutlookProvider EXPR | Set-OutlookProvider -Server $null
Now the appropriate CAS FQDN will be used.
CertPrincipalName Attribute
The CertPrincipalName attribute must match the common name (CN) of the SSL certificate. If a wildcard certificate is being used, it is required to configure the CertPrincipalName for the certificate
Set-OutlookProvider EXPR | Set-OutlookProvider -CertPrincipalName msstd:*.mcsmemail.de
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