We do have a process model in place; however, we encountered an error while working with the Excel plugin.
The node that uses the Export to Excel function is throwing the following error:
"The following error was raised by the Export to Excel function: Your InputStream was neither an OLE2 stream, nor an OOXML stream"
This issue appears to be new, as we did not face any problems earlier.
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Has the plugin you're using been recently updated? That could be a reason why it just "stopped working".
I've only ever seen this error a long time ago when working with Excel's older format (i.e. xls instead of xlsx). If you're also using xls format, a workaround might be to modernize the workflow to use xlsx.