Family member cannot see alexa device

[beagle808]

Plan

Premium

Country

UK

Device

(iPhone, Samsung S10)

Operating System

(iOS 10, Android 10)

My Question or Issue

In our house we have a couple of Echos. My wife and I are in the same Alexa Household and have a Spotify Premium Family account.  The problem is that my Spotify app will only see devices registered to my amazon account and my wife's Spotify will only see devices registered to her account. If I deregister an echo and my wife registers it in her account my Spotify will no longer see it.  How do I go about fixing this please?

[beagle808]

So, I can still only see the Alexa devices that I personally registered.  My wife (who is on the 'household' account and Family Spotify) cannot.  And I cannot see any devices that she has registered.

Can somebody advise please as we are sure that this used to work fine.