Hey @Saandhy_Ganeriwala1, I am sorry to hear you’re having trouble here. Authenticating the Hubspot Trigger node is a pain unfortunately. Unless you absolutely need the trigger functionality I find it usually much simpler to simply poll data from Hubspot in regular intervals using your regular API key.
As for the trigger, have you checked out this mega thread on the topic? It might have some additional pointers as to what might be failing here.