Publication to a Lemmy community from Friendica ?

In the same way I can successfully publish to a Lemmy community by mentioning it in Mastodon, I am trying to do the same from Friendica (latest version 2024.12).

I tried as per instructions in this link and by addressing the community either with a ! or a @ in many ways, always unsuccessfully ("post being delivered" from Friendica, but it never does). Same result for many communities, different Lemmy servers (0.19.8). And it's not a blocking issue as I manage a Friendica and a Lemmy server and the same result occurs.

Yet I can read in Friendica from Lemmy communities with no issue.

Has anyone had any success? Am I missing something?