I recently started a new job, and wish to have my work and private calendars shown side-by-side on both my workstation and my private GMail account (which I can then see on my Android phone). I've had this working fine over a decade ago. FWIW, both of these are intended to be read-only one-way connections, but continuously updated rather than merely one-time snapshots.
After a few attempts I did get the GMail-to-Outlook part working, and I can also enter the ICS info from my work Outlook calendar into my GMail calendar ... but it is only synced once. Subsequent updates never get synced over to be visible from GMail. I fail to see how that is ever useful.
All guides that I've been able to find refer to older versions of Windows and/or Outlook, and aren't really clear on whether they provide continuously updated synchronisation.
Surely, someone has gotten this to work?