My personal reading of the license conditions:
- Title page: Extended as it is one of the most prominent arguments for selling a magazine.
e.g. A travelers magazine with a nice vacation destination with smiling people on the cover should be a selling argument.
- The same picture somewhere in the middle of the magazine for illustrating an article: standard license.
In both cases you need to acknowledge the author and Adobe stock accordingly.
Look here for more information on licensing: https://community.adobe.com/t5/stock/links-for-licensing-terms/td-p/11366788
(Disclaimer: As always with licensing, this is my interpretation of the rules. I think they are correct and advice is based on reading and interpreting the licence terms and on fair use for both the buyer and the artist/stock company, but I cannot rule out that my interpretation is wrong. I'm not an Adobe employee).