It's possible you have an error while trying to activate your Qobuz pass on Soundiiz.
First, ensure that you haven't previously used this code, as it is intended for a single-use only.
Next, if you already have a Soundiiz account, you must use your original sign-in method when logging into Soundiiz after validating the Qobuz code.
This means that if you didn't create your Soundiiz account using the "Sign in with Qobuz" option, you should use your alternative sign-in method.
Otherwise, you may encounter an error indicating that your Soundiiz account is already linked to a different sign-in method.