I am getting following error message while using cometd library "Exception during handling of messages Unrecognized advice action handshake". The thing which I want to achieve is listening of platform events using this library in lightning.
It was working till last month but now tester reported that its not working and when I investigated, found the above mentioned error message.Has anyone else encountered the same issue.
In notification settings both "Enable in-app notifications" and "Enable push notifications checkboxes" are unchecked as per the suggestion in trailhead for this issue. https://trailhead.salesforce.com/en/projects/workshop-platform-events/steps/platform-event-subscribe#testtheinstantnotificationapp