Based on this Q&A answer:
en.lichess.org/qa/1846/why-cant-i-post-on-the-forum#comment-Pc25gYS6
it seems a user can be an active user in good standing, have established opening and training ratings, and still not be able to post in the forums (due to not having played a game).
en.lichess.org/qa/1846/why-cant-i-post-on-the-forum#comment-Pc25gYS6
it seems a user can be an active user in good standing, have established opening and training ratings, and still not be able to post in the forums (due to not having played a game).