Updated Google calendar event does not send an email to the Guest

[TCSAUS]

When I update a Google calendar event it does not send an email to the invited Guest notifying it of the change. The Guest gets the initial email calendar event invite, but no email updates. 

"Would you like to send update emails to existing Google Calendar guests?" I do click the option Send.

This function is working okay with another Google workspace organizations we are using so I am confident it is not a setting on my Windows 11 laptop. Was working a few weeks ago then all of a sudden it stopped working.

Any suggestions appreciated. Thanks.

[DraztheNerd]

This may be due to individual end user settings. You might want to share the following Google Calendar Help Center troubleshooting resource with your colleagues:

• Troubleshoot missing Google Calendar notifications

[TCSAUS]

Thanks for the reply.

• Troubleshoot missing Google Calendar notifications none of these suggestions resolved the issue. None of my colleagues are getting the issue.

[icrew]

Is "comprehensive mail storage" turned on for your domain? If it is, you'd be able to see whether the messages wind up in your Sent mailbox. Check out https://support.google.com/a/answer/3547347 for more info.

Hope that helps,

Ian

[TCSAUS]

Thanks for the suggestion. It says in the notes "You should enable comprehensive mail storage if you only use Gmail for the Vault feature and forward email to your on-premise mail server or other email provider."  We do not use the Vault feature etc.

Note all our calendars for this Workspace instance send the initial email to the Guest for the creation of the event, but then any updates for the event it will not longer send an email to the Guest. It used to work fine.

[DraztheNerd]

Are any of the guests receiving the update notification email?

Is everyone using a computer managed by the workspace organization?

Has anyone checked to see if the message ended up in their SPAM box?

In the meantime I'd suggest all guests make sure they are using the most updated version of the internet browser being used on their device.

[TCSAUS]

Are any of the guests receiving the update notification email? No

Is everyone using a computer managed by the workspace organization? Everyone internally is using Windows 11 independently. Note Guests can also be external people outside the organization, not sure what they could be using.

Has anyone checked to see if the message ended up in their SPAM box? Yes. Update of event email not there

In the meantime I'd suggest all guests make sure they are using the most updated version of the internet browser being used on their device. Using Google Chrome. 

"Chrome is up to date

Version 123.0.6312.106 (Official Build) (64-bit)"

Thanks

[Code56]

We seem to be having a very similar issue as well.

The initial invite goes out to internal & external (using M365) guests absolutely fine.  When the internal guests accept the invite there is no email, however when external guests accept I do get an email.

When I then change something in the meeting (such as the date or time) the update email is not received by any guest (internal or external).

Did you get anywhere with troubleshooting this?

[Code56]

In my digging on this, I ended up getting a bounce-back that showed a DMARC failure (compauth=fail reason=000).  That led me to realise that DKIM wasn't actually authorised for the custom domain via this post:

Solved: Google Calendar invites failing DMARC checks | DMARCPal

Specifically this bit:

What they don’t realize is that DMARC is passing only because Gmail uses the domain in the Return-Path, which makes SPF pass, and be in alignment. When they don’t start auhentication, DKIM indeed validates, but this happens using Google domains’ signatures, which don’t align with your domain. This makes DMARC fail.

I'm waiting for the DNS change to be made (by a 3rd party) to add the DKIM key, so I can then authorise the domain, and then test if we're still having issues with Calendar notifications.