For all those who copy the given link and end up on "Page not found!" here is the direct access:

http://www.migros.ch/cumulus/de/cumulusextra/cumulusextra.html

Since the Cumulus account is without points, I was able to test it and it seems to work, because I got the message: "Unfortunately, you do not have the right or enough blue Cumulus vouchers to take advantage of this offer. The sum of the selected vouchers must match the sum of the required vouchers. Cumulus-Infoline".

Unfortunately, the proposed offers are not very interesting. Perhaps there will be more attractive offers in the future.