Can't create a pull request

I just installed SourceTree version 3.4.2 and find that I cannot create a pull request.

In the previous version (not remembering which one I had installed) I could solve this with the recommendation indicated in https://community.atlassian.com/t5/Sourcetree-questions/Unable-to-Create-Pull-Request-Default-Browser-Empty/qaq-p/1213475.

But this no longer works. To be able to do the pull request I must do a push and generate it directly on the web, this does work. But if I try it from SourceTree, a dialog tells me that "You don't have any remotes wich have extended integration settings configured, blablabla ...".

When trying a push, it is very likely that I need to refresh my OAuth token, which for some reason is lost for this operation only.

As much as I update my credentials, do a refresh of the OAuth token, nothing works.

I can do fetch, pull, tag, commit but not a pull request. 

I think it is important to mention that my account in bitbucket is through google, that is, I have not created a user. Under this condition, to reproduce the behavior you just have to create a branch from Sourcetree in any repository and then try to create a pull request.

The Remote button on the toolbar never changes state, always showing the exclamation point even though my credentials and token are correct and up to date.