We had same requirement sometime ago, which we could resolve as in following flow :
Flow 1: - When a new email with attachments arrive, save in One Drive folder
Flow 2 : - When a file is created in One Drive folder (the same folder as in Flow 1), Excel Get Rows -> passing the File Id from the trigger.
Remember, you need to have a dummy file with the metadata in this folder first to be able to design your table mapping for the Excel insert row. Once you have done the mapping, you can remove the reference to the dummy file and point to the File Id in the source file for Get rows.