Disappearing keyboard on iPhone XR

Do you mean you’re using an app version? WK doesn’t have any officially supported apps.

One of the third party iOS apps uses API1, which is on its way out. So unless the creator comes back and updates the app, it’ll be non-functional in a while. Numerous people have come on recently because of errors cropping up now that WK is making back-end changes.

An app for iOS that uses the new API tokens is tsurukame. ^^