Tax ukey can't enter letters on the password page. You need to contact customer service. Maybe it's backstage. It is suggested to reset it to numbers, which is how the system is set up, or try another input method.

Tax Ukey is an identity authentication and information encryption device of electronic invoice service platform, which can help taxpayers to handle basic services such as issuing, filing, querying and uploading of VAT ordinary invoices and electronic ordinary invoices.