In the doc below the instructions inform you to use the URL below for Import Tokens process however that link comes back as invalid on Metamask for Token Contact Address.
Docs URL: https://docs.mysterium.network/node-runners/payout-guide/#link-metamask-to-the-polygon-network
URL instructed to use: https://polygonscan.com/token/0x1379e8886a944d2d9d440b3d88df536aea08d9f3