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Weak steam

Check, in order:

The setting. STEAM POWER in the app: 1 is low, 3 is high.
The tip. Milk dried in the holes.
The gauge dropping from 1.8 towards 1.4 bar while steaming is normal (owner report).

Steam that stays weak after that points to scale or the probe (La Marzocco's German FAQ): authorised-centre work.