Already there.
Connect Google Calendar and Meet links are on by default. No second account, no second sign-in.
There is nothing extra to connect. Google Meet comes with your Google Calendar connection: leave the video call in your booking rules on Google Meet and every event Darwin creates gets a Meet link from Google, sent to the visitor in the invitation. Book with Calendly instead and a meeting type with a Google Meet location does the same job. Prefer Zoom? Connect it and switch the video call.
Connect Google Calendar and Meet links are on by default. No second account, no second sign-in.
The invitation comes from your own Google account, the way any calendar invite does, with the Meet link already inside.
Switch the video call to Zoom or to none in your booking rules whenever you like. Existing events keep their links.
Sign in with the Google account that hosts your meetings and approve what Google asks for. That is the only setup there is.
It is the default in your booking rules. Save the rules and you are done.
A visitor confirms a time. Google creates the Meet link as it creates the event, so the link is in the invitation before you have seen it.
No. There is nothing to connect for Meet on its own. When Darwin creates the event in Google Calendar it asks Google for a Meet link, and Google puts it in the invitation.
Yes. Give the Calendly meeting type a single Google Meet location. Calendly then adds the link itself, through your own Calendly to Google connection, and Darwin shows the confirmed booking.
No. The link in the invitation opens Google Meet in a browser. Whether guests without a Google account are let straight in is set by your Google account's Meet settings, not by Darwin.