I am creating a data frame by reading a table's data residing in Azure backed unity catalog. I need to write the df or file to GCS bucket. I have configured the spark cluster config using the GCP service account json values.

on running : 

df1.write.format("parquet").save("gs://dev-XXXX-analyt-XXXXXXXX") getting error :
Insufficient privileges: User does not have permission SELECT on any file.. what could be the reason or resolution. Need help