Why were they able to change the adhesive being used during the rollout (i.e. different to the original one used, that works). This screams of the flammable tape issue they had in Starliner too. Shoddy QA and procurement process.
You change the adhesive by issuing an Engineering Change Order. This is an engineering approval step.
In this situation, the specific adhesive probably was no longer available. Happens all the time.