I was using oracle\instantclient_11_2\ location before installing workflow builder.
Connect Using is showing me only one client as above "Instant Client 22.214.171.124"
My system path is now set to old one of oracle\instantclient_11_2.
I reboot and try again. It did not work.
I just installed Toad for Oracle 13.3 and I am still having the same issue.
here are the details of my ORacle Home
Instant Client - 126.96.36.199 (188.8.131.52)
In system PATH:Yes
Home is valid:Yes