Even if there are some advantages to logging in with a Microsoft account, such as using OneDrive, many users still prefer to work with a local account. However, Microsoft is not one to give up easily and points out at every login that it would be much better to use a Microsoft account.
To disable these warnings, open the Machine, for example, by pressing Windows+I, select System, and click Notifications and Actions in the left-hand column.
In the main window, under Notifications, uncheck the Prompt for suggestions on-device setup completion methods to get the most out of the Windows checkbox to eliminate annoying reminders.