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Tasks and iOS Reminders

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I have found that Tasks created in Thunderbird (102.2.1) on a CalDav server I use (Synology Calendar v 2.4.5-0930) are not visible on an iPhone (iOS 15.6.1 but earlier iOS versions have same issue) using the Apple Reminders app. Thunderbird can connect to the Synology Calendar, as can my iPhone. Calendar events I create in Thunderbird show up in iOS Calendar app, and event reminders show up in the iOS Reminders app. Thunderbird Tasks I create do not appear in iOS Reminders. Why is that and can it be addressed?

I have found that Tasks created in Thunderbird (102.2.1) on a CalDav server I use (Synology Calendar v 2.4.5-0930) are not visible on an iPhone (iOS 15.6.1 but earlier iOS versions have same issue) using the Apple Reminders app. Thunderbird can connect to the Synology Calendar, as can my iPhone. Calendar events I create in Thunderbird show up in iOS Calendar app, and event reminders show up in the iOS Reminders app. Thunderbird Tasks I create do not appear in iOS Reminders. Why is that and can it be addressed?

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Looks like Mozilla will develop an iOS app in 2023 that'll (hopefully) connect with Thunderbird's Events/Tasks! So many of us use an iPhone and/or iPad but do our work on PC's. The iOS Calendar app seems to be buggy, we need something better.