Manual mappings always overrule mappings initiated by a control surface. It is not possible to switch modes (SESSION, USER 1, USER 2 & MIXER) on the Launchpad with MIDI learn engaged in Live, so make sure you set the required Launchpad mode first then hit 'MIDI Learn' in Live.
Why can't I switch between modes on the Launchpad when Ableton MIDI learn is engaged?
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