This is not related to updating Android. Please follow up at https://forums.bitfire.at/topic/1259/rev-must-not-appear-more-than-once-in-a-vcard-component/
How are you doing ?
I tried to sync my contacts on Samsung S8 with Daylite server ,but if set URL as “Http://daylite server name:port” will be show that “Can not find CardDav server”, but if set as “Http://dalite server IP:port” no any problem . why like this ,my mobile and Daylite server are same local network .
Please reply me ,thanks