server.app – Removing Admin Permissions in certain channels?

I have a server in discord im the owner, and i have members as admin and co-admin in the same server, i did removed permission to send message in certain channels for them, but they still can send message.

  1. I removed send message in settings of server.
  2. I removed send message in channel.
  3. I removed send message in category.

But still same issue 😥

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