non-mandatory-script-verify-flag (Invalid Schnorr signature)

I attempt to put this right into a Psbt:

1. Alice make cost to buy an quantity of BRC-20 from Bob
2. Bob request to inscribe a switch of BRC-20 through the use of Burner account
3. Burner inscribe the switch of BRC-20 and switch to Bob
4. Bob switch the BRC-20 to Alice

Bob create the Psbt and Burner account, and signed. Then ship to Alice to make cost and signal.
Alice topup on worth to cowl all following transaction’s community charge.

Points dealing with now could be find out how to get the required enter utxo params from earlier output?
Is that this doable btw with bitcoinjs-lib or any advocate library?

Supply hyperlink