I recently bought a new phone and set it up while I was on holiday. I realised when I got back that this locks the region to the country you set it up in. I hadn't really done much on the phone yet so I deleted my Samsung account and created a new one. I just realised today that some notes I made with important information can't be opened anymore as they are linked to that account! Is there anything that can be done about this?
If you have a Windows PC, install Samsung Notes for Windows and login.
Or you can do this: Sync your Samsung phone (everything) with Samsung cloud. Doing so will save the locked notes as well. Now, delete the app data of Samsung notes or simply uninstall it. Next, reinstall and restore everything. Hope this will work for you.