Hi, since updating Thunderbird (Fedora 36) to 102.2.1 (from thunderbird-91.12.0-1.fc36.x86_64), my personal calendar, hosted on Google Calendar, has started to have sync issues, with now being empty, without error message. Re-starting Thunderbird, synchronizing or hiding/re-showing the calendar (which helped in the past) doesn't help in any way. I couldn't find a corresponding bugzilla and wanted to hear if it's a generic issue and how to proceed with debugging. I've even removed the calendar re-add it, Thunderbird discovers my calendars properly, using gmail.com as location and my corporate e-mail as login. During first synchronization, I get a bunch of ``` 10:21:43.099 Calendar: Invalid alarm for item: 1-0-5e276357f7219c00016e1645 (BEGIN:VALARM TRIGGER:PT15M END:VALARM ) exception: [Exception... "Illegal value" nsresult: "0x80070057 (NS_ERROR_ILLEGAL_VALUE)" location: "JS frame :: resource:///modules/CalAlarm.jsm :: set icalComponent :: line 499" data: no] calItemBase.js:953 ``` And then: ``` 10:21:56.614 REPORThttps://apidata.googleusercontent.com/caldav/v2/myuser@acme.com/events/ [HTTP/2 403 Forbidden 53ms] 10:21:56.679 REPORThttps://apidata.googleusercontent.com/caldav/v2/myuser@acme.com/events/ [HTTP/2 403 Forbidden 55ms] REPORT https://apidata.googleusercontent.com/caldav/v2/myuser%40acme.com/events/ Status 403 Forbidden VersionHTTP/2 Transferred541 B (65 B size) 10:21:56.780 uncaught exception: [calCachedCalendar] replay action failed: <unknown>, uri=https://apidata.googleusercontent.com/caldav/v2/myuser%40acme.com/events/, result=2147500037, operation=[xpconnect wrapped calIOperation] ``` But then, other (group) calendars using the same account sync without issue. Thanks, Eric PS: on the bright side, Thunderbird uses a lot less CPU cycles. Very appreciated.