360 Stereoscopic video VR

I have tried to follow this video and https://www.youtube.com/watch?v=4dObRg_R15E&t=3s but it only shows the left eye (image). I understand if I connect the Add node to the UV’s texture sample it shows me the right eye (image) however I do not have much experience with materials.

Version 5.6.1

Any help will be apricated TY