I can't receive text messages through my MacBook

There are a few articles in Apple Support on these matters.

This covers most detail for connections & troubleshooting.

• Use Continuity to connect your Mac, iPhone, iPad, iPod touch, and Apple Watch - Apple Support

https://support.apple.com/en-us/HT204681

The Mac generally shares cellular &/or wi-fi from iPhone, or other direct

internet connection to sources of this specific signal. Some 'titled' items

may not apply in troubleshooting a single issue. While some require two

or more, to bridge the gap of non-connectivity.

iPhone Cellular Calls: Make and receive calls from your Mac, iPad, or iPod

touch; when those devices are on the same network as your iPhone.

• About iMessage and SMS/MMS - Apple Support

https://support.apple.com/en-us/HT207006

• Add or remove your phone number in Messages or FaceTime - Apple Support

https://support.apple.com/en-us/HT201349

• How to forward SMS/MMS text messages from your iPhone to your iPad, iPod touch, or Mac - Apple Support

https://support.apple.com/en-us/HT208386

Sometimes, simply restart the Mac, unless its settings had been significantly changed.

When system upgrades may have changed defaults, go through & re-set them again.