Qobuz does not accept the signature parameter. It has something to do with the app secret. Either the app secret could be wrong, or revoked, or it could be that QObuz requires that specific app secret to be used in the specific way. I know that there was a app secret that had to be Xor'ed in a special way.
It is not as easy to pick up an app secret for QObuz as they use MD5.
Many thanks for your reply and continuous support, Jonas!
Since the app secret is hashed, is picking it up even doable?