Running dynamics export through Python prevents import

Hi.

So what I'm trying to do is export some address related data from Microsoft Dynamics CRM as a .xlsx document, run it through some python code which essentially retrieves the geocoding data for the address and create a new .xlsx that matches the old one in structure, but with the new geocoding data added on. However when I try to re-import the new data it gives an "Invalid Format in Import File" error. From my understanding it might have something to do with the hidden "do not modify" fields or the like, but I don't understand just why CRM doesn't want to accept the new data when all the fields are exactly the same. Is there some missing formatting that I can't find that isn't being replicated?

In the end I can kind of resolve the problem by just copying over the new data by hand, but the goal is to completely automate this process. I've also tried taking the new data and adding it to the original .xlsx file using openpyxl, but it's encountering a permissions error and not letting me access it.

Thoughts on how to resolve this?