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iCloud Calendar not syncing with Thunderbird

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I installed the iCloud agenda in the thunderbird 91.8.0 . This works fine, but when I try to sync I get an error saying that the sync is not done. The strange thing is that I have the same problem on another computer with thunderbird. I use the parameters for the Apple Specific App (2 factor identification). So I made an App specific password for Thunderbird (from the Apple ID website for the 2 factor identification). I choose 'network' when I install the agenda. Thunderbird detects the agenda , but when I try to sync I get an error. The parameters I use are : https://caldav.icloud.com/.well-known/caldav (network address). What can this be ?

I installed the iCloud agenda in the thunderbird 91.8.0 . This works fine, but when I try to sync I get an error saying that the sync is not done. The strange thing is that I have the same problem on another computer with thunderbird. I use the parameters for the Apple Specific App (2 factor identification). So I made an App specific password for Thunderbird (from the Apple ID website for the 2 factor identification). I choose 'network' when I install the agenda. Thunderbird detects the agenda , but when I try to sync I get an error. The parameters I use are : https://caldav.icloud.com/.well-known/caldav (network address). What can this be ?