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Provider for Google calendar on Thunderbird/Lightning has been essential to keeping our lives on track for many years already.

The latest hiccup with Thunderbird 60.9.0, Lightning 6.2.5 and GCal provider 4.4.2 not showing any calendars to subscribe and re-requesting authentication was solved by setting

general.useragent.compatMode.firefox = true

in Thunderbird advanced settings. Cheers and keep up the good work!