I have tried many times to join this testnet but can't join at all. Created account and connected wallet to Metamask. But nothing comes just reload state. I am providing with screenshot if any help please help me I want to join this testnet.
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Appears you are using some mobile wallet's inbuilt dapp browser, those rarely work properly with websites made for desktops (DOP is one of them), so do this — assuming you are on android; install kiwi browser, install metamask extension therein, import/create new wallet as you prefer, go to DOP website, switch to desktop version from sidebar then connect, it should work.