I'm using Thunderbird with Lightning and can't dismiss Google Calendar reminders. I click on dismiss and nothing happens.

Calendar is not read-only.

I've got this kind of errors in "Error Console"

[calGoogleCalendar] Modifying item xxxxxx failed:2147500037: {
 "error": {
  "errors": [
    "domain": "global",
    "reason": "forbidden",
    "message": "Forbidden"
  "code": 403,
  "message": "Forbidden"

There is a similar issue reported in another question. There are a couple of things there you may want to try.

  • Ignore reminders for that calendar (if it is an option for you)
  • Clear the cached data if your issue is about a Exchange calendar
  • 1
    The workaround described there helped. Thanks @manuelvigarcia – KirdApe Feb 27 '18 at 9:42

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