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  • Is this for Outlook/Office365? Or some other provider? If it's for Outlook/Office365 you need to migrate away from Basic Authentication to OAuth. If you've not done that yet you should delete your calendar and re-add it. (Or do what I did, which is to add a new one and then delete the old.) Commented Oct 31, 2022 at 16:33
  • This does not explain why the add-ons stopped working. Commented Nov 1, 2022 at 15:35
  • Unless you define "stopped working" it could easily explain why your calendar no longer displays appointments. Commented Nov 1, 2022 at 15:38
  • Precisely, that is what I wrote in my original question ("TbSync plugin is not compatible"). Note that I did not ask about calendar but about the compatibility of the TbSync plugin. The question of authentication does not arise if the plugin is not enabled at all – since it is not compatible. Commented Nov 1, 2022 at 15:48