How to turn off sound alerts for allies?

My friend and I just got the free version of SC2, and were playing a Co-Op vs AI match w/ some friendly AIs as well. The “Your ally is under attack,” and “your ally’s base is under attack” message were basically interrupting each other for most of the match to tell me about things happening, and it was pretty annoying. Is there any way to turn these off? Or is the only way to mute allies’ notifications to also mute your own?

Thanks in advance

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