There’s no difference how you purchase a TPA, but you need to consider the following if you are connecting with other decentralized Wallets:
Mobile: access Stage Meta from the decentralized Wallet’s App:
Open the decentralized Wallet App
Open the browser inside the App
Enter stagemeta.world.
Desktop: check that you are accessing from a safe, stable connection and have the decentralized Wallet’s extensions installed in your device.