So, the Nokia support replies and said that this is an App issue of DAVx5 but I have to wait for future Updates of the Phone too The support isn´t good and the 7.2 is a buggy phone with a lot of problems. All updates and patches bringing new problems. I decided to send it back and buy another phone. I hope this will help.
icloud Reminders Sync Problem
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Reminders sync doesn’t work after Apple update the app. https://support.apple.com/HT210220
You can look the link. I can not write my problem clearly due to my English level. Sorry.
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We know. When you update the Reminders in iOS 13, Apple removes CalDAV support for Reminders, so that they can’t be synchronized anymore.
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I have added it to “Known problems” here, too: https://www.davx5.com/tested-with/icloud