404 Error in V2 Rest Client

Hi, i have a XML Etim 7.0, and i am developing a code just to get the info from Groups/Features/Values But when testing from the V2 Rest Client, not all groups/features/values are working, some gaves me a 404 Error. For example "EC002625" is a group which gives me the 404, but if i search at https://viewer.etim-international.com/ i can find it. Am i doing something wrong ? Do i need to config something in the rest client to use a specific ETIM version ?

At all times you must specify what version of a class you want to retrieve, either by class version (in this case class version 7 in ETIM 7.0) or by ETIM release version (ETIM-7.0). See screenshots attached, both give back the same result.

On release version ...

On class version ...