Please describe the problem.

$ git annex assistant
git-annex: S3 bucket not configured

What version of git-annex are you using? On what operating system?

git-annex.linux.6.20180914 - the one i had gotten after autoupdate

Have you had any luck using git-annex before? (Sometimes we get tired of reading bug reports all day and a lil' positive end note does wonders)