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Cross premises Delegation See See Archive mailbox access Mailbox on-premises - archive in the cloud Supported, no extra prompts Supported - Users get an extra prompt for credentials when accessing the archive, they have to provide their alternate ID when prompted.

1st and 3rd party apps must be separately investigated by the customer.

com Required Required The value of this regkey is a verified custom domain name in the tenant of the organization.

To learn more about service principals, see.

After successful sign-in, if Skype for Business or Lync says "Exchange needs your credentials", you need to provide the credentials that are valid for where the mailbox is located.

However, in some environments due to corporate policies or on-premises line-of-business application dependencies, the users may be using some other form of sign-in.

Azure AD and Office 365 require all domain suffixes associated with Azure AD directory to be fully internet routable.

This is because each application has their own supportability authentication protocols.

Skype for Business SFB Online should have Modern Authentication turned ON.