The price protection on a route benefit can only be set within US cities.
You may be receiving an error if you have access to Uber Rewards, but are requesting a route in a city where we are not live.
You may also be receiving an error if you are requesting a route that is between two cities. For example, you can't set up a price protected route between New Jersey and New York City, or between Orange County and Los Angeles. Both locations on your route need to be within one city.
Please note that in rare circumstances, we may not have enough pricing data between two locations to set up a price protection route. In these cases, we recommend choosing a different set of locations to set up your price protection benefit.