P20 connected but wont play music through dual bluetooth?

My Wife has a Huawei P20 phone which can connect to 3 BT devices. It is connected to two echo dots with no issues. However, when playing spotify on the phone, only one echo dot will play the music. This is not an Amazon Dot issue as I can get it to work from my S10. Is there a setting somewhere with the P20 that needs to be turned on to play media to two devices at a time? (note I am not asking about a setting for two bluetooth connections at a time - the P20 phone and both dots show they are connected, just no music plays on one of them)

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