Make sure that your "Metamask" wallet is connected to Avalanche network. You can find guide how to add Avalanche Network to "Metamask" wallet on this link [https://support.avax.network/en/articles/4626956-how-do-i-set-up-metamask-on-avalanche](https://support.avax.network/en/articles/4626956-how-do-i-set-up-metamask-on-avalanche)