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by checking the source code I figured out how to get this working:

when using https, the url will become this: https://<username>:<token>@bitbucket.org/{workspace}/{repository}.git

According to the manual of Bitbucket, you need to use this:
https://x-token-auth:{repository_access_token}@bitbucket.org/{workspace}/{repository}.git
so the username should be "x-token-auth"