First verify that the address of the imported wallet matches your original wallet address.

If the addresses match, simply add the token to your token list.

If they don't match, it means the wrong private key or mnemonic has been imported. This could happen for a few reasons:

• You may have multiple mnemonics/private keys, and the one you imported is not the wallet you intended to restore. In this case, locate the correct one and re-import it.
• The mnemonic/private key you backed up is incorrect, or you made an error when entering it.