The situation in our company is that we're using an Exchange Hybrid setup with the mailboxes on prem. We are using one of the latest Outlook desktop clients (so that should be sufficient). The function is working for me on the outlook web client on my dev tenant just fine, but I don't see the outlook addin for our production tenant with the mailboxes on prem.
Is that something that's not working? I don't see anything regarding that circumstances in the docs.