Digitec's response on this subject is incorrect.
Given that the drone weighs more than 900g at take-off and has a category 2 (C2) CE mark, i.e. is in the "Open" category, A2 certification is compulsory.
A2 certification is compulsory. (A1/A3 theory + A2 exam) at the FOCA offices.

EASA link
https://www.easa.europa.eu/en...

Exactly, "If I want to fly in this drone category, I must obtain the A1/A3 **and** A2 certificates."
https://www.bazl.admin.ch/bazl...

So according to the relevant sources, it's relatively clear:
With certificate A1/A3 → you are allowed to fly, but only under A3 rules (150m distance to residential, commercial and industrial areas, no uninvolved persons in the vicinity). Anything less than 150 metres away requires an A2 certificate.

you can do it online at https://www.dronelicense.eu/ and you can skip the appointment at the bazel, it's really easy! and you have as many attempts as you want without any extra costs

The Mavic 4 Pro falls into category C2, which means that an A1/A3 online course is required. For flights in A2 areas, the A2 certificate is recommended, but it is not mandatory to fly the drone at all. The Mavic 4 Pro does not fall directly into the A2 category, but requires specific certifications based on the flight conditions.