You are using notification channel on Fiori Launchpad. You find the following GET request is getting 404 Not Found in the http trace:
And the error message is "The requested entity of type 'CHANNEL' does not exist".
SAP Fiori Launchpad
Notifications, notification service, /IWNGW/CM_HUB/041, SAP_WEBSOCKET, SAP_SMP, /IWNGW/CL_OUT_NOTIF_EMAIL, /IWNGW/CL_OUT_NOTIF_SMP, /IWNGW/CL_OUT_NF_WS_AGENT , KBA , OPU-GW-NOT , Notification , Problem
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