I'm not able to input my VAT number in Switzerland

What is the VAT format in Switzerland? Should it not be 0?

The VAT format has to be inputed strictly as below, depending on your language:

In FR : CHE-111.111.111 TVA
In DE : CHE-111.111.111 MWST
In IT : CHE-111.111.111 IVA

Careful : Don't forget the "TVA" in the end (or MWST or IVA).

Moreover, the VAT in Switzerland is not applied to orders as long as you give us a valid VAT number. Without VAT number, we can't verify this and have to apply it.