The first thing you may want to do, before enabling Multi-Factor Authentication for any users, is to consider configuring some of the available settings. One of the most important features is a trusted IPs list. This will allow you to whitelist a range of IPs for your network. This way, when users are in the office, they will not get prompted with MFA, and when they take their devices elsewhere, they will. Here's how to do it:
Log in to your Azure Portal.
Navigate to Azure AD > Conditional Access > Named locations.
From the top toolbar select Configure MFA trusted IPs.
Reference:
https://www.kraftkennedy.com/implementing-azure-multi-factor-authentication/ The Trusted IPs feature of Azure Multi-Factor Authentication bypasses multi-factor authentication prompts for users who sign in from a defined IP address range. You can set trusted IP ranges for your on-premises environments to when users are in one of those locations, there's no Azure Multi-Factor Authentication prompt.