I would try the TagInfo app from NXP to read the tag. It seems that older Samsung devices didn’t play nice with MIFARE Classic natively, so you need to use the appropriate app. You could also try updating the S5 to the latest firmware (System Update in Settings).
Are you trying to set up a DT product, or some other access control card? None of the DT tags are MIFARE Classic, AFAIK. What is it exactly that you’re trying to do?
have you really seen people unlock their macbook with an acr122u? it cannot be done without some specific auth software for mac… i don’t know what software that is, i just know it’s not built in to the OS is all. a quick google turned up mac support here - https://www.rohos.net/