'No "Create Pull Request" option in XCode 13.2.1

Having heard about the possibility to create and comment pull requests, I was about to try this feature:

I have successfully added by BitBicket Cloud account in Preferences using an App Password.
I can see my repository, branches.
I can create branches and view changes.
e.t.c

However, nothing related to pull requests is available:

Is there anything I have to set or enable for this feature to be available?

Thanks for any help in advance.

Sources

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