Issue while opening an online TM

One of my clients requested me to start using online TMs on a regular basis. In order to start using it they sent me the server address where I can find these TMs.

First, I inserted that address in the appropriate place and the server address was immediately recognized and become available. Then a list with the names of all online TMs available from that server appeared. However, when I click on one of these TMs from the list nothing happens which means that I cannot have access to the TMs.

Does anyone know ow can I fix the problem in order to have access to the TMs?