Customise angular web portal header title

Hello everybody, I am new with One Identity, and I need to change the "Product Name" in the web portal. I cannot find where to do this from the administarion portal. And I have tried to use the same API call that modifies the default theme and the logo to modify the product name but I get the error that sazs: the configuration setting ServerLevelConfig/ProductName was not found. I also came across this thread but I could not as well make this work, and I assume from the response that this should be feasible. So if anyone can help that would be much appreciated. Thanks