Failed to connect to backoff(elasticsearch

Hello, I have some issues with agents enrollement.
My agents are enrolled using a policy with Endpoint integration. The issue is that these agents display no logs message, and do not appear in Administration tab (a stuck message is displayed : Endpoints are enrolling. View agents to track progress).
By investigating, I've found in filebeat logs file, the following message Failed to connect to backoff(elasticsearch( : 403 Forbidden.
Pinging the address ( shows nothing more than Waiting period for the application exceeded.
How can I solve this issue ?

Do you have the filters setup in the elastic cloud to only allow access from specific IPs?

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