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This error means that a ServiceNow user has no access to the specified queue (see the snow_chat_queue group that is configured in your kbot.conf DevOps > Developer Tools > Configuration Business Unit). Provide access to a user on the ServiceNow side and try again.
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This means that the Inbound REST API endpoints are not defined. Check that the API path (in the sample above it is /api/veefr/koperator/join) is the same for the snow_chat_queue variable (stored in the kbot.conf file DevOps > Developer Tools > Configuration Business Unit) and the ServiceNow script.
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