Claiming authorship for substantial work on a single-author-only paper I recently worked on a research project for a client of my organization who was chosen for a highly prestigious lecture in my field (delivered annually). As part of convention, the lecturer is also afforded the opportunity to publish, ahead of the lecture, a single-author-only invited paper in a high-profile journal. From what I understand, no other authors are &quot;allowed&quot; to appear, but having been the sole person responsible for producing literally all tables, models, and visualizations in the manuscript,  I still feel strange about this.
I wrote all code used to wrangle and analyze the data and am listed in the acknowledgments for &quot;data and statistical support&quot;. Would it be acceptable (conventional, ethical, etc.) for me to list this publication alongside the others (for which I am listed as author) on my CV?
If so, what's the appropriate format? Can it be Only-Author, [Publication Title] or Only-Author et al., [Publication Title]?
This kind of scenario does happen somewhat frequently at my organization, so just thought I'd try to get some insight to avoid raising any eyebrows for grad program applications/future employers. Thanks in advance!
Would it be acceptable (conventional, ethical, etc.) for me to list this publication alongside the others (for which I am listed as author) on my CV?

No.  If you are not on the author list in the publication, never imply that you are on the author list in your CV.  It's dishonest, even if you deserved to be on the author list.