Same problem here. Just had a chat with the stadia support. The kind gentleman on the other end said that I need to have both my TV and receiver supporting eARC to have 5.1. Everything else works fine...
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Same problem here. Just had a chat with the stadia support. The kind gentleman on the other end said that I need to have both my TV and receiver supporting eARC to have 5.1. Everything else works fine (prime, netflix, even casting to CCU outputs 5.1). Unfortunately I will return my order and cancel my subscription if this is not resolved soon.