Please save the text file again as CSV then convert that CSV file to UTF-8 format using below steps.
- Open the CSV file with Notepad++ by right-clicking on the file and choosing Edit with Notepad++.
- In Notepad++, choose Encoding > Convert to UTF-8 without BOM. This will change the encoding of the file to UTF-8 without adding any extra bytes at the beginning of the file.
- Save the file and close Notepad++.
You can try now to import the CSV file to Azure SQL again.