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This didn't work when I tried to add my existing remote calendars, because the section that tries to validate them always fails, even though I have all my passwords for those accounts. Perhaps it's not meant to work with email aliases?

Diese Bewertung wurde für eine vorherige Version des Add-ons (72.1) abgegeben. 

Hi

may you contact me by email for this issue : cardbook (at) cardbook.icu ?