You have square brackets around your key in the map script URL, remove those.
If you are just getting started, you might also want to take a look at Azure Maps. It's Microsoft latest mapping platform. The Azure Maps web SDK has a lot more performance benefits, and licensing is much easier than Bing Maps. Here are some resources:
- Main product page: https://azure.com/maps
- Code samples: https://azuremapscodesamples.azurewebsites.net/
- Docs: https://learn.microsoft.com/en-us/azure/azure-maps/
- How to create an account: https://learn.microsoft.com/en-us/azure/azure-maps/how-to-manage-account-keys