I have received the FMC server "FMC Address: https://fmcrestapisandbox.cisco.com/ " whereas there is no FTDs , can you please share the FTD detail such that we can proceed on discovering those on FMC

Hi Team,     Can anybody please assist me here , https://sandboxapicdc.cisco.com/ page only loading , even login screen is not coming up.   I have tried across Crome,Safari , same issue. Please suggest , how to resolve so