Thanks for your question.
Here is a possible solution for the issue you are facing.
The way to ensure that the backup file is consistent is to export a database that has no write activity during the export or create a copy of the database and do the export from that copy.
1. Create a database copy.
You can check how to create a copy of the database using the portal at https://docs.microsoft.com/en-us/azure/sql-database/sql-database-copy-portal
2. Remove the Job related objects from the copy. Please make sure you are connected to the copy.
3. Export the database from the copy.
4. Delete the database copy.
Let us know if this works.