@Cindy Shin Thank you for reaching out to us, As I understand you are looking for information on the warning appearing on your dashboard related to ipv6 "Organizations that use named locations in conditional access or identity protection should take action as soon as possible to prevent service impacts."
As you might have read in the article - https://github.com/MicrosoftDocs/azure-docs/blob/main/articles/active-directory/conditional-access/location-condition.md We have started introducing IPv6 support into Azure AD services in a phased approach, so if you are using Ipv6 in your organization, you need to define ipv6 information in named locations and use those named location in conditional access policy settings, so that you can leverage this feature related to ipv6 support in Azure AD.
No action is required if your organization is not using ipv6.
Let me know if you have any further questions, feel free to post back.
Please remember to "Accept Answer" if answer helped, so that others in the community facing similar issues can easily find the solution.