If I got it right you want to reach to the 9x environment and take actions from the 10x one.
The 10x Central needs to trust the 9x target. You could provide a truststore and truststore password where you should make sure the 9x targeted Central is trusted. One way to do that is to use to 10x Central's truststore /var/security/client.truststore.
A process similar to the one explained here: https://docs.software.hpe.com/OO/10.70/Content/Administer/SecurityHardeningGuide/Import_Certificate_Central.htm?Highlight=client.truststore#
Hi, I had same issue when I used operation "Dynamically Launch Flow" via deployed CP in HP OO Central 10.80. Operation was configured to connect to localhost via https (TCP 8443).
I found two ways how to fix it
1. Either set trustAllRoots in "Dynamically Launch Flow" operation to true
2. download client certificate (copy to file) which is used when you connect to hp oo central web gui via https and add it to your hp oo central keystore
Import it to your hp oo central keystore
keytool -import -file c:\hpoolocallabclientcert.cer -alias "hpoolocallabclientcert" -keystore "C:\Program Files\Hewlett Packard Enterprise\HPE Operations Orchestration\java\lib\security\cacerts"
Then you enter your keystore password (initial was: changeit)
And then you enter "yes" when you are prompted with this
Know flow should be executed succesfully via "Dynamically Launch Flow" operation
You can then also try to delete it again to see if flow will fail