Microsoft SSO not working

Hello, I have enabled the '''''Allow Windows single sign-on for Microsoft, work, and school accounts''''' setting via GPO for Desktops, and it is showing as ticked. Additionally, within '''Settings > Email & Accounts''', my account is showing underneath ''Accounts used by other apps'' However SSO does not seem to be working whenever I go to the likes of office.com However, within the likes of Google Chrome (with the Microsoft Single Sign On Extension), SSO works seamlessly. Does anyone have any ideas? Thanks so much.