This question stems from a broader question at:
I often run into the uncomfortable situation where a corresponding author will not share details about received peer review and editorial decisions. I am not sure how common such a situation is, and what is the best procedure to follow.
This happened where I was not the first author however I did much (if not most) of the writing and data analysis. Therefore I feel more than just entitled to read and discuss reviewers' comments. At least once I was left with the impression that no strict peer review actually took place (on a paper where the PI was friends with the handling editor).
I was wondering whether it would be appropriate if I directly contacted the journal seeking to receive the provided peer review and editorial decision. (After requesting and being ignored by both the first & corresponding author(s)).