Hi,
I did some research and you are correct about the MFA enforcement by Microsoft, starting Oct 15th. However, this enforcement is required only for accessing the Admin Portals, like Azure, Intune and Entra ID. Here is the official announcement:
And here there is a list of the applications affected by this enforcement:
Although it affects the service accounts, you are still able to have some accounts without MFA enabled, but these users won't be able to access the Admin portals. So it technically won't affect your flows. In any case, if you are not comfortable with the enforcement, it's possible to apply for postponing the enforcement date to March 15th 2025 (highlighted in green above), so you can have more time for planning what to do (and to monitor the feedback of other users with similar issues that didn't apply for postpone).
Finally, Microsoft docs confirms that MFA enforcement applies exclusively to users that access the platforms listed above:
If you need to access data from any of these portals within your flows, then you should consider to use an HTTP request combined with an App Registration (as the registration happens in the Azure Portal, you would need to execute it with an MFA enabled account).
Let me know if it works for you or if you need any additional help!
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