Failed to create the contact center and received an error email stating “__MISSING LABEL__ PropertyFile...”

In Service Cloud Voice, creating a Contact Center requires an active Identity Provider (IdP) to be configured and enabled in your Salesforce organization. The Identity Provider allows Salesforce to act as a single sign-on (SSO) provider for Amazon Connect.
If you attempt to create a Contact Center while your organization's Identity Provider is disabled, the provisioning process fails and you receive a confusing error email containing placeholder label text rather than a meaningful message.

Error Email Details

The error email subject and body contain placeholder label references, as shown below:
Subject: __MISSING LABEL__ PropertyFile - val subjectFailedIdpErrorCreateContactCenter not found in section ProvisioningStatusEmail
Body: __MISSING LABEL__ PropertyFile - val bodyFailedIdpErrorCreateContactCenter not found in section ProvisioningStatusEmail

These placeholder labels indicate that the Identity Provider was not active at the time of Contact Center creation.