Hello,
I've created a list but users cannot add items via "+ New" button as they get below error:
As you can see, the field "Title" is not empty, but still user cannot save the item.

Hello,
I've created a list but users cannot add items via "+ New" button as they get below error:
As you can see, the field "Title" is not empty, but still user cannot save the item.
I had a similar issue. Try opening a monitor session and then preview the powerapps and go through it as a user would. Fill in 1 form area per time and click submit to test the process and where it goes wrong. Share your findings and i might be able to help further.
Can u also share the patch code? Remove any PI information by placeholder names/data.