When starting the app on the register screen -> "Advanced" The field "IMAP server" is configured as a number, so no text can be entered.
Fixed by https://github.com/deltachat/deltachat-android-ii/commit/130ecf2bb1cb8c20ea40c3b36d6adbd697d1b444
Most helpful comment
Fixed by https://github.com/deltachat/deltachat-android-ii/commit/130ecf2bb1cb8c20ea40c3b36d6adbd697d1b444