Adding an Affiliate Message with the after_entry_header hook

Hi,

I have added an affiliate message following the very helpful video made by Leo:

https://www.youtube.com/watch?v=txJcxZoheoA

Everything Leo does in the video I was able to replicate, except the final step he did at 4 min 35 sec.

He was changing the priority from 10 to 15 to move the affiliate message under the featured image, which is what I would like to replicate.

I was unable to move the affiliate text under the featured image on my site. I tried setting different priorities starting from 10 (default), 15, 20, 25, and 30, but it did not move the text.

Can you please advise?

Thanks,
Zoltan