I am also having a similar issue even if I do Accept it and not Tentative. I can’t seem to change anything to get it to sync with google
The latest version 10.3.2622 on Mac Sequoia & version 10.3.2619 on Windows 11 seem to sync invites to my own Google calendar ok.
What version of eM Client desktop have you got ?.
Also you should not be seeing Tentative or OutofOffice anymore on the desktop via right click as “Google Calendar online only supports Free and Busy” as per extract from @Olivia_Rust below.
“Quote Extract below on Google Calendar states”
https://forum.emclient.com/t/out-of-office-status-no-longer-offered-in-calendar-event/109710/5
Quote: “With a standard CalDAV account you will see all 4 states (Free/Busy/Tentative/Out of Office) but for example Google Calendar only supports Free and Busy states”.
If you are still seeing Tentative and OutofOffice in eM Client for a Google Calendar, then you might have an older eM Client version as “those options were meant to be removed” and was a mistake they were still showing in Google Calendar events as @Olivia_Rust advised in this thread post.
The only ongoing issue I’ve personally still find with synching invites not updating in Google Calendar online “using the latest 10.3.x desktop and 10.3 mobile beta apps” is eg: If you receive a Google calendar invite from eM Client Android app to eM Client iOS app, when you press accept in the iOS app “it still only updates in the eM Client iOS Google calendar in the app”, but never syncs to the same Google calendar account online.
It does however sync online to the same Google Calendar ok “if it’s visa versa sent from iOS to Android”. So some bug still in the iOS app.