nft_transfer cross contract call panic throws

[aiqubits]

near-contract-standards: 5.5
nft example: 5.5
function: nft_transfer
call code: https://github.com/aiqubits/l2e-near/blob/main/src/contracts/l2e/src/lib.rs#L324
test code: https://github.com/aiqubits/l2e-near/blob/main/src/contracts/l2e/tests/main.ava.js#L146
corss contract call panic: "Smart contract panicked: Sender not approved"