RmzGTR can you go to:
SETTINGS>NETWORK AND INTERNET>TAP ON YOUR SIM and then let us know what Operator Settings you have listed.
Then SETTINGS>NETWORK AND INTERNET>TAP ON YOUR SIM>ACCESS POINT NAMES
Check to make sure your carrier info is correct.
If not go to SETTINGS>SYSTEM>RESET>MOBILE WIFI BLUETOOTH and reset those which should prompt the right settings to be implemented.
Also check to see if you carrier supports your device as the project relies on extracting carrier settings from the stock Pixel Experience as supplied to Google by your carrier.