Setting up a /e/OS with an /e/-Account: Ressrouce recognition fails

Hey guys,
I have just installed /e/ on my Galaxy Tab S2 and wanted to add a /e/-account in the Accounts section (add account, /e/). However, it tells me “Neither a CalDAV- nor a CardDAV-service was found”.
Any idea how to solve this?
Thanks a lot in advance for your support

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