I hope you are fine.
Integration with OpenCTI is not officially supported, but I have found a script that you can test here:
There is also another Github repository where they are working with OpenCTI integration:
And also this script that can be tested:
Finally, here you can find some useful information to create your custom integration scripts:
If any of these things work for you, you can send me the errors you are having in the Wazuh manager:
# less /var/ossec/logs/ossec.log | grep -i opencti
And the errors in the script itself.
I hope this helps.
Thanks