You can't use ACX or Spotify download codes for advance review copies, because they only become available when the book is actually live. In addition, ACX has severely limited the number of review copies (25 US & 25 UK on release; then another 25 each once you've made the requisite number of sales). Spotify codes are limited to 100 unless you choose Voices Plus distribution (not recommended, see Distributing Wide.) Additionally, at this time Spotify only allows ratings, not written reviews.

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HCB uses Bookfunnel to distribute ALCs to our curated list of vetted reviewers.

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Reviews are collected prior to the audiobook's release (if you have set a release date) and then Audible or Spotify codes are shared only with the top reviewers, to be posted as close to the live date as possible.