Not much information here, but I do have a hunch.
My hunch:
- This email lives in an Email Program
- This email is being used for an A/B test in the Email Program
Issue:
- You won't be able to reference and email when it lives within an Email Program and is being used for the A/B Test
Solution:
- You need to remove the A/B test from that Email Program in order for it to show up for use outside of the Email Program