This is another one of those open-ended quest steps
As we’ve spoken about in the past, Hogwarts Legacy does do a pretty good job of telling you where to go next (if you so choose), but sometimes it can be cryptic. Here’s how to investigate the Goblin Presence in Hogwarts Legacy.
To investigate the Goblin Presence, head into the tent in the keep and read the note on the table
Investigating the Goblin Presence takes place during the Percival Rackham’s Trial mission, towards the start. Directly after you acquire the ability to cast Petrificus Totalus, you’ll enter a keep inhabited by goblins. You have the option to directly confront and eliminate all of them, or sneak around and get by on stealth alone.
Whatever your choice might be, you will need to investigate the Goblin Presence via a memo in the tent. Facing the doorway you used to enter the keep (where you learned Petrificus Totalus), turn left. See that little tent there? It has the memo you need. Just walk up to it and read it, and the quest will progress.
Turn around and face away from the tent. That spire is your next quest objective, where you’ll slowly make your way down to Percival Rackham’s Trial, and continue with the main storyline. Goblin presence investigated!