I heard through the grapevine of the Berlin tech scene that actually both SAP and Telekom failed to deliver a working COVID Warning app.
A small software company in Berlin purportedly ultimately 'fixed' the app for around 3 million EUR but this was kept under wraps (the app ended up costing 220 million taxpayer money by the end of 2022).
Not sure if this is true but it sounds like it absolutely could be.