If the user has manually tested a successful SSO authentication as specified in 'SSO Authentication Error Scenarios for Salesforce Voice (formerly Service Cloud Voice)' and still sees the Omni-Channel Dial-Pad as grayed-out, please verify the following:
If the user observes this error for 'ccp-v2' network requests in Browser Developer Tools, it means that the callCenter metadata for this Contact Center has an incorrect value in 'Instance Name' field/attribute.
Due to this, despite having a successful SSO Authentication at Amazon Connect, the ccp load request is being sent to an incorrect Connect Instance domain/URL which does not exist, therefore "ERR_NAME_NOT_RESOLVED" message is seen for such a request.
<?xml version="1.0" encoding="UTF-8"?>
<Package xmlns="http://soap.sforce.com/2006/04/metadata">
<types>
<members>{your_contact_center_internal_name}</members>
<name>CallCenter</name>
</types>
<version>64.0</version>
</Package>
***The "correct value" is of the format [Contact_Center_Internal_Name + OrgId_When_Contact_Center_Was_Created] and it can be retrieved by following either of these two approaches :-
005316460

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