You need to have writer access to sync appointments to the selected Google Calendar. Please check with the Google Calendar owner in case syncing is required.
Step 1: Log in to Google and visit calendar.google.com
Step 2: Navigate to the calendar you want to integrate. Hover over the calendar, click the … icon and choose “Settings and Sharing”
Step 3: Scroll to “Share with specific people” > Click “Add People”. Here you can add the email address you use for XOLBY.
Step 4: Next, set Permissions to “Make changes to events”. Click Send to save changes. Your Google calendar should now be synced.