While I'm trying to set the SourceTree to communicate with a Bitbucket server, I get an SSH Key: "no key found" message.

The SSH key I'm using to connect the Bitbucket server is located both in my SSH agent and Keychain.
I didn't find any updated solution for that for macOS Catalina.
Can you please assist?
Versions:
macOsCatalina 10.15.4
Sourcetree 4.0.1