It's the board where that sprint was originally created on. Although sprints are independent of boards (meaning they can contain issues from any project and they can appear on multiple boards across multiple projects), in order to create a sprint, you have to do so from a board. This independence can complicate this, because if you don't know which board this sprint was created on, it's possible there are other projects in play here that you might not have permissions to see. In which case if the sprint was created in a project that you don't have permissions to view, you won't be able to correct this without a Jira administrator granting you the proper permissions in that project.
In order to do this, you need the manage sprints permission in each project on the board where this sprint was created on.
I would recommend asking the user that created this sprint, which board they used to create it. Ultimately, that will likely be the best course of action to figure out that you are using the correct board.
Once you have the correct board: From there edit the board settings and see what the JQL filter in use here is. Depending on which projects this board is pulling issues in from will determine which projects you need to check you permissions in. It's likely this is pulling issues from multiple projects. If your JQL filter in use on this board does not have a 'project=' or 'project in' statement, then its safe to presume that it's possible Jira is gathering issues from potentially every project in this Jira instance.
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