Are you including DOMAIN\ both in SA and when entering credentials?
USERID Contains a string corresponding to a Qlik Sense user name. Qlik Sense will get the login information from the proxy and compare it to the value in this field.
Hope this helps
I have written following script:
upper("Access") as ACCESS,
upper(NTNAME) as NTNAME,
upper(Region) as REGIONCODE;
SQL SELECT "emp_code",
FROM [lib://Desktop (abcd)/SectionAccess.xlsx]
(ooxml, embedded labels, table is Sheet1);