Movement can strain seals, discharge fittings and electrical connections, and wastewater may be present. The casing is not a safe handle for moving the whole installation.
What the observation means
Even a small unit can be attached in ways not visible from the front. A flexible connector does not permit arbitrary movement.
A useful next step
Leave it in place and explain access restrictions. Clear only loose surrounding items. Do not lift it to inspect underneath, fit a mat or photograph a label; appropriate service access should be planned by the person undertaking the work.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.