Interviewbit , Atcoder Api not working Properly

[YPcoderYP]

when i request for repeated user like tourist then it works well but when i request for small user then it give different errors like Invalid username, API broken due to site changes

[virtualmanu]

when i request for repeated user like tourist then it works well but when i request for small user then it give different errors like Invalid username, API broken due to site changes

can you please provide the links to which works and which doesn't?