I have a story map that is shared publicly. I double and triple checked all of the maps within it and all of the layers are also shared publicly. I checked our organization page and it allows anonymous viewers. I'm also mostly certain that it didn't require a sign in a month ago and I didn't think we changed anything, but I do know there were a bunch of ESRI updates since we last made edits.
Here is the link to the storymap: https://storymaps.arcgis.com/stories/059861db45fe45fc88c9f3aa0ff7aabb
I am able to view it as well; very nice work I should add!
Are you logged into a single sign on (SSO) type of arrangement? Sounds like something is clobbering your attempts and not ours.
I tried from a personal computer, and we are all on home networks not a work network so I have no idea why it appears that some people are not asked to sign in but others are.
@ErinReilly1 -- I scrolled all the way through the story in several browsers (in regular and private browsing modes) and was not prompted to sign in either.
Where/when exactly is the login window appearing? Is it when the story first loads or when you get to the map? Could you share a screenshot?
Have you received reports from others who get prompted to sign in, or is it only you? You may want to try clearing your browser caches. You could also try unpublishing and republishing the story. If you still see the prompt, I would recommend contacting Esri Support and they can help troubleshoot further.
@ErinReilly1 -- I asked several of my colleagues to check and we are all not getting prompted to log in. We're all on different home networks as well.
The only other thing I can think of is that maybe you and your colleagues who are experiencing this issue are all connected to the same VPN, which might have a filter or blocker that is causing the login prompt. If so, try accessing the story while disconnected from VPN.
If that's not the issue, the next step would be to please contact Esri Support as they can work with you to try to isolate what the specific issue might be.