Webhook supscription events not received

Today I'm not receiving webhooks notifications about account presence on Sandbox enviroment.

How can I know if the service is working properly?. I receive the subscription status "Active" when calling https://platform.devtest.ringcentral.com/restapi/v1.0/subscription

It is the first time that I have this troubleshoot. I have tried to create new credentials but the problem persist.

*Update:
If I subscribe to /restapi/v1.0/account/{accountId}/extension/{extensionId}/presence/dnd
I do receive the webhooks events of DND.

But I want to subscribe to all presence events of all account extensions