diff --git a/changelogs/fragments/5019-slack-support-more-groups.yml b/changelogs/fragments/5019-slack-support-more-groups.yml
new file mode 100644
index 0000000000..184bab353a
--- /dev/null
+++ b/changelogs/fragments/5019-slack-support-more-groups.yml
@@ -0,0 +1,2 @@
+bugfixes:
+  - slack - fix incorrect channel prefix ``#`` caused by incomplete pattern detection by adding ``G0`` and ``GF`` as channel ID patterns (https://github.com/ansible-collections/community.general/pull/5019).
\ No newline at end of file
diff --git a/plugins/modules/notification/slack.py b/plugins/modules/notification/slack.py
index bdc839f9a8..f10d4003d6 100644
--- a/plugins/modules/notification/slack.py
+++ b/plugins/modules/notification/slack.py
@@ -293,7 +293,7 @@ def build_payload_for_slack(text, channel, thread_id, username, icon_url, icon_e
         # With a custom color we have to set the message as attachment, and explicitly turn markdown parsing on for it.
         payload = dict(attachments=[dict(text=escape_quotes(text), color=color, mrkdwn_in=["text"])])
     if channel is not None:
-        if channel.startswith(('#', '@', 'C0')):
+        if channel.startswith(('#', '@', 'C0', 'GF', 'G0')):
             payload['channel'] = channel
         else:
             payload['channel'] = '#' + channel