Using classic Outlook for Windows in business environments
Hi Steve,
Did you subscribe the google calendar by adding the "Secret address in iCal format" to Outlook?
If this describes your situation, please replace the "https://" in the url with "webcal://" and check the result:
I've tested in my Outlook for Microsoft 365 and it works at my end. Please have a go and see if this can make the google calendar update properly.
If an Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.