So, you derailed and the joy is long gone in your team. This second part shows a possible way forward. Although it's probably not widely applicable (YMMV), the proposed end goal is what matters... If you stop fussing over labels but focus on what matters you're likely on the right track.

Hear, hear! If you go through rituals without understanding the values and principles... It's not Agile anymore so stop pretending. Another certification isn't going to save you at this point.

There are indeed other options beyond the model with "one enum with all the errors".