Struggling to figure out why our AppFoundry integration is consistently receiving a 407 Proxy Authentication Required error when attempting to register SIP endpoints across multiple Genesys Cloud organizations. The integration uses the Platform API to manage telecom settings and dynamically updates SIP trunk credentials for each tenant. While the initial OAuth token acquisition succeeds, the subsequent SIP registration requests to the Genesys Cloud edge fail during the handshake phase. The error payload indicates that the proxy server is rejecting the credentials, despite them being correctly formatted and verified against the Genesys Cloud admin console. We are using the latest version of the Genesys Cloud SDK for Node.js, and the network configuration allows outbound traffic on port 5060. The issue appears isolated to the secondary organizations in our federated environment, while the primary org registers successfully. This discrepancy suggests a potential caching issue with the proxy authentication tokens or a misconfiguration in the multi-org routing rules. Has anyone encountered similar issues with SIP trunk registration in a multi-tenant AppFoundry deployment? Any insights into debugging proxy authentication failures at the edge level would be appreciated.