Hi

I recently ported my Vodafone cellular phone number to Telekom and got a Prepaid Sim. This sim is active as of this morning and works perfectly in my phone. But I can't add the contract to my existing Telekom account. The account already has my home VDSL contract listed. But when I try to add the prepaid sim in the magenta App per this guide, I get an error: Unfortunately that did not work.Please try again in a few minutes.

How should I continue?