Hi Laura thanks for commenting in our community! Since you want to only view this document it might be easiest to export and share this document in Teams. You can select the three horizontal lines on the top left toolbar on the board select Export and choose what format you'd prefer.

You can also share a board by following these steps but it would add a tab to a Team channel. You could then adjust the collaborator permissions as "View". I hope this helps! Let me know if you have additional questions!