I am able to connect to my server using ssh on my machine and same has been configured on Bitbucket SSH Key.
I have double verified SSH private key and public key still bitbucket is unable to authenticate to my server.
Okay, this is good to know. I have not specifically verified it, but it sounds to me that the SSH key is not further mounted from the pipelines container into the pipe container. My assumption here might be completely wrong as not verified, but maybe you can verify this. When the pipe is run, it should show all arguments passed to docker for the pipe, and if the pipe would not re-mount your configured SSH key, it is not available. Maybe the pipe you use has also some variables to set the SSH key path and then it's expected you specify it (via that pipe variable) explicitly. Hopefully this is leading you towards a working solution already. Please let me know.
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