I have a flow for 365 calendar to Google calendar which works for me. If I want to "Send a copy" of the flow to another user to use it for themselves, it starts out well enough when they click the link:

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Once they take care of that, which I assumed would be all that would be needed, it fails for reasons alluded to here:
In this case, it's the two calendar ids.
For the first one (Office 365's, a very long string), I found that swapping this in instead of the id worked:

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But it's the Google one that I can't find a variable for:
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Of course, I could have some dummy value there and have the user edit it with their Gmail id, but that's a last resort. I've tried calendarId and calendar_id, as they're mentioned here, but they're not valid.