Ich versuche, das Deutschland-Ticket zu kaufen, aber jedes Mal, wenn ich versuche, den Verimi-Verifizierungsprozess durchzuführen, schlägt er immer wieder fehl. Kann ich etwas tun?

Maybe try a different provider like mo.pla or so?

Verimi is out of business. You can uninstall the app. As long as you can’t change the authentication provider with the company you want to buy your ticket from you have to chose a different provider for the ticket. The ticket provider needs to change the authentication provider asap or they won’t sell any more tickets.