Hey @wassim, welcome to the community!
I am very sorry to hear you’re having trouble. The “HubSpot Developer API” credentials (which combine OAuth2 with developer-token-based authentication) are incredibly annoying to get right.
Personally, I’d almost always go for the regular node (allowing much simpler token-based authentication) and poll my data in short intervals over using the trigger.
However, if you do want to use the trigger you might find this mega thread on various Hubspot authentication issues helpful. It has a few points you might want to double-check.