I am having the same problem. Using Windows app version 12.103.78366 CL The interface is quite limited - I don't see an Extras option to find the key combination settings. The option is checked to Enable UDP. Tab key works fine in applications on my own computer. But for the remote, the tab key will move to the next field, but the focus seems to be removed. I can press the tab key a second time, then the field will accept keystrokes. Or I can click on the form anyplace, and the focus is correct. If it's a form that allows me to move to another field using up or down arrows, it works correctly. But the tab key is not correct. Another example: I can move around the form with the tab key, but I have to press the tab key twice each time - first time seems to move it, second time activates it, next tab advances to next field but not ready for input, press tab key again and keyboard works.
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