The appId xxxxxxxxxxxxxxxxxx does not exist in the Legacy region. Please make sure you are using legacy(i.e. v1.*) app. If you are using v2 Apps, you need v2 SDKs.
https://github.com/maciejtreder/comet-chat-angular is the link for github project I referred.
Hello @vivekcabot,
You are using JS SDK v1.8.3 with a v2 app. Please update the SDK to the latest JS SDK v2.0.7. Updating to v2 will require some changes in the app as well. Please go through this migration guide and make the required changes.
Migration Guide: https://prodocs.cometchat.com/docs/js-resources-upgrading-from-v1
Thank you 
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