Perhaps the file extension is confusing AE/Premiere.
Have a read here:
https://kb2.adobe.com/cps/406/kb406350.html
In section: MPEG-2 (MPG, M2P, M2V, M2P, M2A, M2T)
Are your AE / Premiere installs fully updated to the same point as the other machines you tried?
AE and premiere do tap into the OS for additional codec encode/decode capabilities. So if it were an issue with a non standard codec like Xvid for example I would suggest that the codec might be damaged or in need of updating. However, AE and Premiere are supposed to support MPEG-2 natively. Perhaps instead you have an MPEG-2 codec variant of some sort (maybe came with some DVD player software) installed on your machine which AE/Premiere are trying and failing to utilize? Not sure if this is possible on a Mac (I’m a PC user) so perhaps someone else can offer further insight.
Graham Macfarlane
3D animator and VFX specialist
London UK