Hello @krzysztofzelazko, here’s a way to find out the failure reason:
$ dfx canister --network ic call "rrkah-fqaaa-aaaaa-aaaaq-cai" --candid governance.did get_proposal_info "( 127703 : nat64 )" | grep error_message
error_message = "The name Krzysztof Żelazko already belongs to a Neuron";
“rrkah-fqaaa-aaaaa-aaaaq-cai” is the ID of the NNS Governance canister.
Is it possible to modify the description while keeping the neuron’s name unchanged? We prefer not to alter the neuron’s name, but we need to update the description. Is it feasible to leave the name field empty while updating the description?