I actually just watched the video you mentioned (thank you) and saw that the prefersAssistiveTechnologySettings property of your utterance needs to be set to true.
It is now working properly :)
Francois B
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Hello,
I have the same issue.
Did you find a way to use the speech rate value defined in Spoken Content for your utterances ?
Have you found a way to make this work ?
I have a very similar problem. When I get an audio interruption while in background, calling AudioOutputUnitStart fails and I get this error: [aurioc] AURemoteIO.cpp:1590:Start: AUIOClient_StartIO failed (560557684)
Like you, I do have the proper background mode enabled.