Additional meeting and call-related features and issues within Microsoft Teams for business
I had the same issue but eventually found the notes in a bizarre location. In Teams go to Calendar. Open the meeting that you took notes for. Click on "Details" tab. You'll see your meeting info w teams links, etc. Scroll down the page and your notes should be there. Why are the notes hidden away? Should be an easy access through the meeting chat or at least have a "notes" tab like when you start the notes. When I tagged people on action items, they got a link to the meeting notes and those open in Sharepoint.