Alex bridge beta

I tried to connect to the testnet and to do the beta testing, it keeps telling me my address is not whitelisted I refreshed severally it was successful but I noticed that after a while of being connected, I was disconnected and the network took me back to STX mainnet instead of the ALEX testnet i selected. Is this normal? I have been able to connect to the beta bridge again

Eth sepolia : 0x011A9C0F690Ac6724C5436816026C2c0e215764B