Currently, when I get a meeting request from a contact, all I see in Pipedrive is an email with the standard email controls (1) and an ICS file (2) attached to it:

In addition to those, I'd expect it to offer the standard meeting controls (accept, decline etc.) found in Outlook:

The rationale here is that I want to stay in Pipedrive for as long as possible to maximize my productivity, but this is one of those small "paper cuts" that keep forcing me to go back and forth between Pipedrive and Outlook (and sometimes even Teams).