First of all, please make sure that you are on the right portal. You must activate the SIM card where you bought it. 

Digital Republic: https://connect.digitalrepublic.ch/dr/ 

Digitec: https://iot.digitec.ch/digitec/ 

Pc Tip: https://data.pctipp.ch/pctipp/ 

Conrad: https://sim.conrad.ch/conrad/ 

Otto Fischer: https://connect.ottofischer.ch/of/ 

Please enter the SIM ICCID number without any spaces.