Thanks for the quick reply.

dbutils.fs.ls("dbfs:/databricks/certs/")
[FileInfo(path='dbfs:/databricks/certs/aws-global-bundle.pem', name='aws-global-bundle.pem', size=152872, modificationTime=1728053118000)]

secret_scope="myScope"
user = dbutils.secrets.get(secret_scope, "MyUser")
password = dbutils.secrets.get(secret_scope, "MyPass")
url = dbutils.secrets.get(secret_scope, "MyURL") #format: jdbc:mysql://DOMAIN:PORT/SCHEMA
host = dbutils.secrets.get(secret_scope, "MyHost")

options = {
    "url": url,
    "query": "select 1 as id",
    "user": user,
    "password": password,
    "useSSL": "True",
    "sslmode": "required",
    "serverSslCert": "dbfs:/databricks/certs/aws-global-bundle.pem",
    "isolationLevel":"READ_UNCOMMITTED",
    "enabledSslProtocolSuites":"TLSv1.2",
}
df = spark.read.format('JDBC').options(**options).load()
df.display()​

Same error:

SparkConnectGrpcException: (java.sql.SQLTransientConnectionException) Could not connect to address=(host=HOSTm)(port=PORT)(type=master) : (conn=715518) Connections using insecure transport are prohibited while --require_secure_transport=ON.​