Also, what does the file structure look like for the disc when you view it in your computer? I give you the benefit of the doubt that you followed the guide correctly. But when people that are new to this have discs that are completely unreadable on a PS4* (as opposed to just having issues and skipping a lot), I find that the most common reason is that they’ve burned the ISO to a disc as a file.
i.e., they will see a file such as E:\starwars.iso instead of a folder such as E:\VIDEO_TS or E:\BDMV.
*also, an off topic reminder to all of the helpful people here that when someone has this issue with an Xbox One, don’t tell them to burn another disc! They bought a machine that is intentionally made not to play recordable media. Most people don’t know that and discs are expensive. 😃