On the PS4 Pro, the disk drive is on the front left side of the console. When I put the disk in, as soon as I hear it's in and stopped inserting, I would "hit" not "tap" that top left corner. I was surprised at how hard I had to hit it. When the drive tries to read the disk, you can hear it trying to spin and find the spot it needs. When you hear that attempt again, you can try and hit it again. Sometimes it would work on the first attempt, sometimes on the 2nd, 3rd, 4th etc. I remember it trying around 4 or 5 times, then pause, then another 4 or 5 times, before it would give you a disk reading error. Sometimes I'd have to eject the disk, and just go through all that again.
It's beyond ridiculous that this even has to be done. I finally gave up on having to do this, and purchased the online version of the game I play 95% of the time, After spending $160 back in Dec to Sony to fix/replace the drive, it started again literally 2 weeks after the 90-day warranty on the original repair, expired. They refused to help me out. They couldn't tell me exactly what they did the first time (either fix or replaced the drive3?). I had it set up to send it in again, but then cancelled it. To !&&* with them.