[2] Assigned to two Junior Grand Prix events, they placed eighth in Ljubljana, Slovenia, and seventh in Aichi, Japan.

Competing in the Challenger Series (CS), Müller/Dieck finished tenth in September at the 2015 Nebelhorn Trophy – their first senior international – and eighth the following month at the 2015 Mordovian Ornament.

Müller/Dieck were included in Germany's team to the 2016 European Championships in Bratislava, Slovakia, but were eliminated after placing twenty-third in the short dance.

[7] In spring 2016, Müller/Dieck began training under Marina Zueva in Canton, Michigan, in addition to Schulz and Young in Dortmund.

NRW Trophy champions for the second time, they then won their fourth consecutive silver medal at the German championships.

They did not return to the Grand Prix, but won the inaugural Denis Ten Memorial Challenge and the Open d'Andorra, followed by becoming German national champions for the first time.

[8] This result qualified a berth for a German ice dance team at the 2022 Winter Olympics in Beijing.

[8] Initially assigned to the 2021 Cup of China on the Grand Prix, upon its cancellation Müller/Dieck were reassigned to the 2021 Gran Premio d'Italia.