Using classic Outlook for Windows in business environments
the fix I found is to use this tool https://www.outlookgooglecalendarsync.com/ I used the beta version (setup.exe) and worked like a charm out of the box, and I strongly recommend to check the video tutorial at https://youtu.be/Oi9JPw2ETyg?feature=shared
(The code-base is open on github so I felt confident in using it)
You can even choose which "directions" to synk, eg from outlook to google, or from google to outlook