Hi Dennis,
If you are looking for a guide please see below:
Migrate from MFA Server to Azure AD Multi-Factor Authentication
https://learn.microsoft.com/en-us/azure/active-directory/authentication/how-to-migrate-mfa-server-to-azure-mfa
Prerequisites
- AD FS environment (required if you aren't migrating all your apps to Azure AD prior to migrating MFA Server)
- Upgrade to AD FS for Windows Server 2019, Farm behavior level (FBL) 4. This upgrade enables you to select authentication provider based on group membership for a more seamless user transition. While it's possible to migrate while on AD FS for Windows Server 2016 FBL 3, it isn't as seamless for users. During the migration, users are prompted to select an authentication provider (MFA Server or Azure AD Multi-Factor Authentication) until the migration is complete.
- Permissions
- Enterprise administrator role in Active Directory to configure AD FS farm for Azure AD Multi-Factor Authentication
- Global administrator role in Azure AD to perform configuration of Azure AD using Azure AD PowerShell
If this is helpful please accept answer.