Im not sure that is the problem as stated by the error from the job stage:

'''

com.mongodb.MongoTimeoutException: Timed out while waiting for a server that matches WritableServerSelector. Client view of cluster state is {type=UNKNOWN, servers=[{address=<<REDACTED>>:27017, type=UNKNOWN, state=CONNECTING, exception={com.mongodb.MongoSocketWriteException: Exception sending message}, caused by {javax.net.ssl.SSLHandshakeException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target}, caused by {sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target}, caused by {sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target}}]

'''

Id also like to point out that I did verify connection from inside the node:

'''

%sh openssl s_client -connect <REDACTED>:27017 -CAfile /Workspace/Users/<REDACTED>/rds-combined-ca-bundle.pem

'''