Apparently there is no way you can completely disable the Answers, based in this discussion in the community of Twitter.
Note that as mentioned by the member of staff, Fabric now has two separate installation modes: one for the Crashlytics and another to the Answers. You can try to make a new installation for the same application and just enable the Crashlytics.
Otherwise, as in the conclusion of this discussion above, "Bundle id/package name" has been requested for the user and so it appears that it has been manually deleted by a team member.
After I posted the question here, I did some more research and found this same discussion. I think it would be nice for them to provide a way to disable the service in a simpler way. Thanks for the help!!!
– Arubu