Hi Amaro,
What worked for me was exporting from Adobe Media Encoder. If you have a Creative Cloud subscription – even just a one-app Premiere subscription, you should have access to this application as part of the bundle.
Here’s a screengrab showing the presets that are relevant – under Broadcast > MXF OP1a > XDCAM HD – at the bottom, select XDCAM HD 50 and you’ll find that the resultant codec is MPEG-2, although AME doesn’t make that clear in the label.

I hope that helps you!
Best,
Adriane