Hey @szymon_dybczak  @vidya_kothavale  facing similar issue not sure how to resolve.. 

cluster runtime : 16.4 LTS (includes Apache Spark 3.5.2, Scala 2.12)
mongodb spark connector : org.mongodb.spark:mongo-spark-connector_2.12:10.5.0

code: 

df = (spark.read
.format("mongodb")
.option("spark.mongodb.read.connection.uri", "mongodb+srv://nucleus-auth-prd:<mypassword>@prd-default-pl-1.gzopt.mongodb.net/nucleus-auth-prd-default?authSource=admin&readPreference=secondary")
.option("database", "nucleus-auth-prd-default")
.option("collection", "userEntities")
.load()
)

Error: 
(com.mongodb.MongoSecurityException) Exception authenticating MongoCredential{mechanism=SCRAM-SHA-1, userName='nucleus-auth-prd', source='admin', password=<hidden>, mechanismProperties=<hidden>}

Can you help what could be the missing piece for me ?