KubiTarock for Windows and Android
Announcement Process
Game Rules > Announcement Process

During the announcement process, the game declared and all additional announcements must be confirmed. Each player, except the declarer, must confirm the game. In addition, each bonus point must be confirmed or challenged by all other players, except the announcer itself:

The announcement process ends, when all declared games and all announcements are confirmed. Afterwards, the game continues with leading the first card.