I added this as a comment yesterday instead of as an answer.
We had issues with this very issue. That is a Samsung S10e calling a Moto Z4 and the person on the S10e not being able to hear the Moto Z4.
I found that System Update 14 has a fix for this. This update did not update automatically for the 4 phones that we fix with this update yesterday. They had to manually go in and check for the update.
Update notes for System Update14
- Includes performance improvements that increase the stability of your phone.
- Addresses a one-way audio call issue on specific devices.
Go to Settings, System updates, Check for Updates.
System update 14 has a fix for this.
Hope this helps
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