Reply To: Users Do Not Register, Default role solution?
https://codex.bbpress.org/forum-settings/
Auto Role
Select the default role for bbPress forum members to be assigned, the roles are Keymaster, Moderator, Participant (Default), Spectator and Blocked. For full details of the permissions assigned by these roles please User Roles and Capabilities.
I haven’t actually used S2Member so I can’t help to much here, but S2 supports bbPress and there should be something about this on the S2 site (I tried a search and mainly get results for our forums here at bbpress.org :/)
If you are importing them ‘manually’ I would say you will have to manually assign the bbPress role, though if this is something S2 does on the fly then I presume it should also be adding the bbPress role at the same time and this would be an S2 issue.
Also to note is that bbPress users don’t actually get the full role assigned to them until they have actually logged into the site.
