Simulate MS Office save using Python [closed]

I want to generate an Excel file and upload it to a website that only accepts .xlsx and .xls, but when I generate Excel using Pandas or Polars I am facing "invalid excel file" exception and when I save this file using Excel without any changes, it is uploaded correctly.

I want to do what MS Excel does without need to install MS Office on my machine (use a programming language like C# or Python). Can I?