Can you try with this config?

options = { 
"url": url, 
"query": "select 1 as id", 
"user": user, 
"password": password, 
"useSSL": "true", # Use lowercase 'true' 
"sslmode": "VERIFY_CA", 
"serverSslCert": "/dbfs/databricks/certs/aws-global-bundle.pem", 
"isolationLevel": "READ_UNCOMMITTED", 
"enabledSslProtocolSuites": "TLSv1.2", }

There are some minor changes please see whether this works in both cluster modes.