Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi!
Welcome to Microsoft Q&A forum.
Based from you information, right now your device is still tied to Microsoft 365 (subscription), so even though you installed Office Home & Student 2024 (one-time purchase), your apps are still running under the 365 license.
First, you need to open and y Office app like Word or Excel, go to File > Account. Then you need to sigh out(M365) to the top right corner, after that close all the apps.
Next, once you re-open Word or Excel it should ask you to sign in. (used the account that has your office 2024)
Try it first and once done let me know so I can assist you further.