Unable to link remote cluster to Kibana dev tool

We have three cluster. Kiibana, Monitoring, ES Compute/data. We are able to get monitoring from Compute cluster to Kibana but unable to link to dev tool.

We tried the suggestion provided here:

And doc:
https://www.elastic.co/guide/en/kibana/current/working-remote-clusters.html

https://www.elastic.co/guide/en/elasticsearch/reference/7.6/modules-cross-cluster-search.html

@LeeDr I hope you might help me here.

I would appreciate your help on this. Thank you in advance.

Regards,
Amit