ERC20 - transfer amount exceeds allowance even already using approve

Question

i got transfer amount exceeds allowance when call transferFrom to ERC20, i already call approve first and already wait until the approve success..but when i call transferFrom, i got the error.

const wdAmount = ethers.utils.parseUnits(trx, 6)
                   
                    var ab = await erc20.approve(senderWallet, wdAmount).then(async response => {
                        var ac = await response.wait();
                        var approveHash = response.hash;

                        var tf = erc20.transferFrom(senderWallet, accounts[0], wdAmount).then(response =>{
                            console.log(response)
                        }).catch(err => {
                            console.log(err)
                        })
                    }).catch(err => {
                        console.log(err)
                        alert('Transaction canceled');
                    })

maybe something wrong with my code, i hopeless right now.