I work for company that utilizes press releases in our Marketing efforts. We use a large distributer to help get in front of our target audience. But we usually repost the press release after gaining consent while following their policies: (1) reference original distributor as the source and include a hyperlink to the original release (2) do not modify any press release wording and (3) do not modify or add hyperlinks within the press release.

Should I be marking these as no-index on our site even though they are coming up as errors on GSC? If they aren't no-index, how do you avoid duplication penalties?