solana. Mint nft with updateAuthority not equal to owner - solana

Question

it`s my first questions on stackoverflow :)
Id like to mint nft to my friend but еto reserve the right to update metadata.
I use my publickey like updateAuthority for CreateMetadataAccountV3InstructionAccounts
but response "Program log: Mint authority provided does not match the authority on the mint"
Thank you!!
const ownerPubkey = new web3.PublicKey(owner);
const payerPubkey = new web3.PublicKey(payer);
const updatePubkey = new web3.PublicKey(update);
const mint = web3.Keypair.generate();
const instructions: web3.TransactionInstruction[] = [];
const signers: web3.Keypair[] = [mint];
const userTokenAccoutAddress = getTokenWallet(ownerPubkey, mint.publicKey);
const metadataAccount = getMetadata(mint.publicKey);
const editionAccount = getMasterEdition(mint.publicKey);
instructions.push(
web3.SystemProgram.createAccount({
fromPubkey: ownerPubkey,
newAccountPubkey: mint.publicKey,
lamports: MINT_RENT,
space: MintLayout.span,
programId: TOKEN_PROGRAM_ID,
})
);
instructions.push(
createInitializeMintInstruction(
mint.publicKey,
0,
updatePubkey,
updatePubkey,
TOKEN_PROGRAM_ID
)
);
instructions.push(
createAssociatedTokenAccountInstruction(
payerPubkey,
userTokenAccoutAddress,
ownerPubkey,
mint.publicKey
)
);
const accounts: CreateMetadataAccountV3InstructionAccounts = {
metadata: metadataAccount,
mint: mint.publicKey,
mintAuthority: ownerPubkey,
payer: payerPubkey,
updateAuthority: updatePubkey,
};
const args: CreateMetadataAccountV3InstructionArgs = {
createMetadataAccountArgsV3: {
data,
isMutable: true,
collectionDetails: null,
},
};
instructions.push(createCreateMetadataAccountV3Instruction(accounts, args));
instructions.push(
createMintToInstruction(
mint.publicKey,
userTokenAccoutAddress,
ownerPubkey,
1
)
);
instructions.push(
createCreateMasterEditionV3Instruction(
{
edition: editionAccount,
...accounts,
},
{ createMasterEditionArgs: { maxSupply: 0 } }
)
);
I use my publickey like updateAuthority for CreateMetadataAccountV3InstructionAccounts
but response "Program log: Mint authority provided does not match the authority on the mint"

Answer 1

When you create the metadata account and mint tokens, you're specifying the mint authority as ownerPubkey, when you previously specified updatePubkey. You should change them to:
const accounts: CreateMetadataAccountV3InstructionAccounts = {
metadata: metadataAccount,
mint: mint.publicKey,
mintAuthority: updatePubkey,
payer: payerPubkey,
updateAuthority: updatePubkey,
};
and
instructions.push(
createMintToInstruction(
mint.publicKey,
userTokenAccoutAddress,
updatePubkey,
1
)
);