Here is a step-by-step guide to troubleshooting if Metamask does not appear when calling the approval function with an ERC20 token:
Step 1: Verify Metamask Installation and Configuration
Make sure you have Metamask installed correctly in your browser. If it is installed but not activated, try activating it by clicking the three dots next to the Ethereum address and selecting “Metamask” > “Activate”
Step 2: Confirm ERC20 token support
Make sure your ERC20 token (e.g. ETH) supports Metamask on your network. You can do this by:
a. Going to the [Metamask]( settings.
b. Reviewing the list of supported tokens and networks.
Step 3: Make sure Metamask is connected
Check your Ethereum account by Metamask
a. Go to [Metamask]( settings.
b. Make sure “Connect Wallet” (or “Wallet” in older versions) is enabled and properly configured.
Step 4: Check contract address
Make sure the contract address you want to call the approval function from matches the address provided by MetaMask when asked for permission:
a. Go to [Metamask]( settings.
b. Click “Wallet” > “Connect Wallet” (or “Connect Wallet” in older versions).
c. Select your Ethereum account and click “Connect”.
d. Go back to the contract address you want to call the approval function from.
Step 5: Verify Metamask functionality
Try enabling full functionality of Metamask by:
a. Go to [Metamask]( settings.
b. Select “Full Wallet” > “Enable Full Wallet”.
c. Click “Save”.
Step 6: Verify token balance and contract permissions
Make sure your ERC20 token balance is sufficient for the contract function call:
a. Go to [Metamask]( settings.
b. Select the wallet you previously connected (e.g. MetaMask).
c. Go to the “Balances” tab.
d. Make sure your token balance is greater than or equal to the required amount for the contract function call.
Step 7: Verify contract permissions
Please make sure Metamask has been granted the necessary permissions for your contract:
a. Go to [Meta-Contract] ( or [Etherscan] (
b. Select your contract.
c. Click “Permissions” > “Grant/Revoke Permission”.
d. Make sure Metamask has been granted the necessary permissions for the contract function call.
Step 8: Verify ERC20 token metadata
Make sure you have access to the ERC20 token metadata (e.g. “0x…”) in your contract code:
a. Go to [Etherscan] ( or [Meta-Contract] (
b. Select your contract.
c. Click Token > Metadata.
d. Make sure the metadata is correct and includes the ERC20 token address.
Step 9: Try again
Once you have completed all of these steps, try accessing the approval feature from Metamask again:
a. Go to [Metamask]( settings.
b. Select Wallet > Connect Wallet (or Connect Wallet in older versions).
c. Click Save.
d. You can download the approval feature from Metamask by going back to your contract address.
If none of these steps resolve the issue, please provide more details about your setup, including:
- The specific contract address you want to call the approval function from
- The Erc20 token address provided by MetaMask when asked for permission
- Any error messages or logs you may have
Hope this helps! Let me know if you have any other questions.