SETTING SEQUENCE
-Duplicate a completed sequence or set up a new sequence by right clicking the timeline you want to and hitting "sequence settings"
-Set this sequence to 1080x1920 (not 1920x1080!) and H.264
EXPORTING
-When you export do 2 pass VBR render at maximum depth and H.264, target bit rate 12 max 20
Match these settings:
Great Video Below