Hi Wael,
I was not able to replicate that result. For example, this request for a TMY file from the psm3-tmy endpoint returns a weather file with data:
https://developer.nrel.gov/api/nsrdb/v2/solar/psm3-tmy-download.csv?names=tmy&wkt=POINT(-111.9728826+33.7418135)&interval=60&api_key=<APIKEY>&email=<EMAIL>
(You will need to replace <APIKEY> and <EMAIL> with your NREL Developer API key and email address.)
Keep in mind that increasing the precision of the latitude/longitude values will not improve the result of your queries, so you may want to use less precise values if doing so avoids this problem.
Best regards,
Paul.