The eraser - from - the local settings palette is inactive. The eraser appears with a red barred circle

The eraser - from - the local adjustments is inactive.
The eraser appears with a red barred circle .

Change the Eraser to the local settings you want to edit or rework, if no local setting is found in the image, the eraser appears with a red circle barred, so if you see this, all is fine and there is just no local adjustments area to make a change into