Hello Martin,
Thank you, the reply and the details.
To be able to increase authentication frequency to a higher number it is recommended to use Conditional Access sign-in frequency in session control.
- Sign in to the Microsoft Entra admin center as at least a Conditional Access Administrator.
- Browse to Protection > Conditional Access > Policies.
- Select policy.
- Under users include all users that will need to use the MFA
- Under Grant check mark the Require multifactor authentication to enable MFA on users
- Under Access controls > Session Select Sign-in frequency and Choose Periodic reauthentication and enter a value of days
In regard to the particular page you shared with us it seems to a bug in numbers shown in the admin center, it is recommended to report it directly to our Microsoft product development team submitting feedback admin center. the product development team continuedly review feedback submitted by user to identify bugs and suggestions for user to develop new features.
You can click on the feedback button in the top right corner to submit the feedback about this.
Please note that the community team and the Microsoft product development team are separate. The product development team is responsible for designing, developing, and maintaining Microsoft products. They work on implementing new features, fixing bugs, and making improvements based on users' feedback and other factors.
To see more details on how to submit feedback, see this article Learn how to provide feedback to Microsoft - Microsoft 365 adminsMicrosoft Learning.
Thank you for cooperation and contribution.