Verizon does not automatically connect in France . All the settings in the phone are correct, chat with a live Verizon tech verified that. No need to reply with what you think is wrong.
Here is how you can get conneted as explained by the Verizon tech.
Turn off WIFI
Goto connections - Mobile networks
Disable Use 5G standalone networks.
Disable Allow 5G ervice.
Disable Data roaming
Then enable Airplane mode.
Wait 10 seconds and disable Airplane mode
Enable all the Mobile network settings.
You should now be connected to 5G
If it did not work...repeat
The connection will not be permanent.
You will need to repeat this multiple times a day.
I wonder if Verizon will ever fix this.