My struggles with trying to gain control of the TV audio to mute the ads, etc., finally resulted in my using analog out set to the variable mode and splitting that between the Phonak streamer and the Vizio soundbar with the TV speakers off. Balancing between TV and surround with the Phonak app gives a very pleasant experience. I have noticed there is a very very slight delay between the HAs and the soundbar. Enough to barely notice but adjusting the balance took care of that, ie, drowned it out. The HAs will time out after 30 sec of no audio and my aud has to set a software switch so that the HAs would automatically reconnect but there is a few seconds delay with that too. However, it means that ANY time you come within range the HAs connect. So, if your TV is constantly on and you are roaming around the house it can be a nuisance… (I will cross-post this comment)
The TOSLINK would not mute for my Vizio TV, perhaps that is true for all TVs. First try with a TOSLINK passive splitter resulted in the streamer working while the soundbar did not. I had to use a powered splitter to get both to work but again no muting of the streamer audio into the Phonak M90s.