Bureaucrats on enwiki need to be able to add (and remove) users to/from the flow-bot group. This is necessary after the Co-op team gets approval for their bot (T76785: Co-op: get approval for hostbot to flow-create-board right).
@MattFlaschen created https://gerrit.wikimedia.org/r/#/c/181120/ so bureaucrats on testwiki and test2wiki could add the Co-op bot, but before it was +2d @Spage as sysadmin was able to add MatchBot to flow-bot on testwiki. That config change could be revived and updated to address this.