If you go to your Tax Information page (Settings > Tax Information), you will see that you are being requested to fill-in your W-8BEN. As noted on this help article -
"The Form W-8BEN is a form used to confirm you’re not a U.S. taxpayer and that Upwork is not required to withhold taxes from your earnings. For record-keeping purposes, Upwork requires a Form W-8BEN for all non-U.S. taxpayers paid on Upwork. Once you file your Form W-8BEN, the system will activate your eligibility to access funds immediately."
Please fill-in this form on your account by typing in your legal name, and address, that matches your Upwork account. Once done, your payment methods should be automatically activated.