Ok I spent some time debugging the script (https://script.google.com/home/projects/1k0oMpC0CtdiwLN9zCbvFM_g2z5LtdtMDfV4QMJWLgMi7gljqfJAJb0iI) and it is definitely doing something, even recently:

Jul 7, 2026, 8:39:40 AM	Info	Looking for events for abran@wikimedia.org...
Jul 7, 2026, 8:39:44 AM	Debug	Importing: [abran] Out of office

And it is finding the @MatthewVernon 'out of office' events, although the script filters by "events modified since last run". Would you mind deleting and re-adding the calendar event(s) @MatthewVernon and we'll take a look at the next run ?

Also unfortunately my user can't write to the sre vacations calendar thus I can't interactively test/debug that part of the functionality. Unattended runs work as expected AFAICS

I've just deleted and re-created my OoO starting 21 July. Thanks for looking into this :)

In T431303#12093395, @MatthewVernon wrote:

I've just deleted and re-created my OoO starting 21 July. Thanks for looking into this :)

Sure no problem, indeed I can see the OOO event starting July 21st. As to why it failed to import the first time, I don't know how to investigate further tbh :(
One scenario I see is:

• event is last modified at T0
• script runs periodically, finds and fails to import the event, eventually the script last run is past T0
• event is not being considered anymore by the script, until it is modified and/or re-added

execution logs don't go back very far (a week) so hard to say what/when might have happened