[Bug 1945200] Re: Updates to Google Calender succeed but produce MODIFICATION_FAILED error

[Olivier Tilloy]

There are a number of upstream bug reports mentioning
MODIFICATION_FAILED
(https://bugzilla.mozilla.org/buglist.cgi?quicksearch=MODIFICATION_FAILED),
but at a quick glance nothing that matches the problem you're
describing, so I'd suggest filing an upstream bug, and sharing the link
to it here.

Also, there are many calendar-related fixes in the new stable series
(91), so it could very well be that the problem is fixed there. As of 5
hours ago, Ubuntu 21.10 has thunderbird 1:91.1.1+build2-0ubuntu1, so you
should be able to update and test that new version (feedback welcome in
the form of bug reports, by the way!).

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https://bugs.launchpad.net/bugs/1945200

Title:
  Updates to Google Calender succeed but produce MODIFICATION_FAILED
  error

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