I have the Galaxy S8 now to hand and I had already purchased the OtterBox Defender Series for it, when I realised that it did not include any form of screen protector. I therefore purchased OtterBox Alpha Glass screen protector for the S8 and understood that this item was compatible with the Defender series.
Upon fitting the Alpha Glass, most accurately to the S8 and then attempting to put the S8 with the Alpha Glass into the two halves of the Defender case, the case did not close completely. Subsequently it was found that when it did close(?) it required VERY hard finger presses to operate the S8.
Upon fitting the Alpha Glass, most accurately to the S8 and then attempting to put the S8 with the Alpha Glass into the two halves of the Defender case, the case did not close completely. Subsequently it was found that when it did close(?) it required VERY hard finger presses to operate the S8.