In Dante Studio v2.6, you can subscribe on Tx channel to two or more Rx channels in Dante Studio. However, the Tx device must be running Dante version 1.3 or higher for this to work properly. If your Tx device is using a lower version, it may experience issues making the second subscription.
To resolve this, please reach out to the device vendor to obtain updated firmware with Dante version 1.3 or higher.