Hi,
Can you hear the person on the other end during a call, if you use the phone in loudspeaker mode or using earphones with a microphone attachment plugged into the phone?
If so you may have to check that you didn’t dislodge/damage the [https://www.amazon.com/PHONSUN-Earpiece-Speaker-Motorola-Cruise/dp/B07ZLZV691|earpiece receiver] during the repair. (supplier example only)
Here’s the ifixit [guide|119794] guide. The earpiece receiver can be seen in the image at Step.4