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Hey there, sorry you're having trouble with your WiFi calls! You went in the right direction to turn off the Google permission to use the microphone, as this is a common issue related to having the Unlock with OK Google function turned on.
I have a couple of questions so that we can try to narrow down the reason for the one way audio.
Do you have any Bluetooth devices hooked up to your device at the time of the calls, or is Bluetooth on at all?
Have you checked to see what other apps have microphone permissions? You can see this in Settings>Apps (or thereabouts)>App Permissions>Microphone; you will want to tap the 3 dots in the upper right hand side and select Show System. Can you take a screen shot of the apps and post it here? I'm pretty curious to see if there's a similar fix as was with the OK Google Detection that can be employed in this circumstance.
I found out a call recording app im using doing the issue with the wifi calling, disabling this app solved the issue
No prob! Glad you were able to figure it out!