The floating keyboard on iPad OS 26 is not displaying.

On iPad OS 26, the custom keyboard works correctly with a full keyboard, but with a floating keyboard, there is only one line and the console displays a constraint error.

Unable to simultaneously satisfy constraints.

Probably at least one of the constraints in the following list is one you don't want. 

Try this: 

(1) look at each constraint and try to figure out which you don't expect; 

(2) find the code that added the unwanted constraint or constraints and fix it. 

(

  "<NSLayoutConstraint:0x600002172c10 V:|-(10)-[TUIKeyboardContentView:0x1039c5410]  (active, names: '|':TUIKeyplaneView:0x1039c3e20 )>",

  "<NSLayoutConstraint:0x600002172c60 V:[TUIKeyboardContentView:0x1039c5410]-(-11)-|  (active, names: '|':TUIKeyplaneView:0x1039c3e20 )>",

  "<NSLayoutConstraint:0x6000021721c0 V:|-(0)-[TUIKeyplaneView:0x1039c3e20]  (active, names: UIKeyboardLayoutStar Prev...:0x105160e00, '|':UIKeyboardLayoutStar Prev...:0x105160e00 )>",

  "<NSLayoutConstraint:0x600002172210 V:[TUIKeyplaneView:0x1039c3e20]-(0)-|  (active, names: UIKeyboardLayoutStar Prev...:0x105160e00, '|':UIKeyboardLayoutStar Prev...:0x105160e00 )>",

  "<NSLayoutConstraint:0x6000021728a0 V:|-(0)-[UIKeyboardLayoutStar Prev...]  (active, names: UIKeyboardLayoutStar Prev...:0x105160e00, '|':UIKeyboardImpl:0x109905fa0 )>",

  "<NSLayoutConstraint:0x6000021728f0 V:[UIKeyboardLayoutStar Prev...]-(0)-|  (active, names: UIKeyboardLayoutStar Prev...:0x105160e00, '|':UIKeyboardImpl:0x109905fa0 )>",

  "<NSLayoutConstraint:0x600002177980 '_UITemporaryLayoutHeight' UIKeyboardImpl:0x109905fa0.height == 0  (active)>",

  "<NSLayoutConstraint:0x600002172df0 'TUIKeyplane.height' TUIKeyboardContentView:0x1039c5410.height == 217  (active)>"

)

Will attempt to recover by breaking constraint 

<NSLayoutConstraint:0x600002172df0 'TUIKeyplane.height' TUIKeyboardContentView:0x1039c5410.height == 217  (active)>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.

The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.