Can't create a pull request

[LuisCarro]

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 ...".

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

I can do fetch, pull, push, tag, commit but not a pull request. How is this possible?
Should I uninstall this version and go back to the previous one?

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.

[LuisCarro]

I have noticed that reverting to version 3.4.1 does not work either.