A given route should be shareable via URL, similar to Google.Here is an example:
https://www.google.com/maps/dir/Huntington+Beach,+CA,+USA/Esri,+380+New+York+St,+Redlands,+CA+92373,+United+States/@33.8586889,-117.7369566,11z/data=!3m1!4b1!4m14!4m13!1m5!1m1!1s0x80dd2422f9c82ab5:0x45ed85c9a4663b01!2m2!1d-117.9988026!2d33.6594835!1m5!1m1!1s0x80dcaa6ab5db2b19:0xa2b2f2aa61d06ef6!2m2!1d-117.1948964!2d34.0572748!3e0
This is available. You can create a route but you have to save it as an item first before sharing. We currently do not automatically create an item under My Content.
Here is a sample route layer
https://jsapi.maps.arcgis.com/home/item.html?id=b2bdac29616c47aeb2f8b3a4e62af046
Doc page
https://doc.arcgis.com/en/arcgis-online/create-maps/create-route-layers.htm
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