Bounded message-construction errors. No supplied bytes appear in errors.
Each reason names the layer that rejected the input:
:invalid_message- message attributes, builder options, or a builder URL.:invalid_field- a field or trailer occurrence, or the combined field bound.:invalid_body- a body availability snapshot.:invalid_transport- transport declarations.
They indicate invalid shapes, unknown keys or options, missing required values, inconsistent states, or exceeded documented bounds in that layer. Correct the input before retrying; no authentication has taken place.