Can Visual Builder Backends Use Multiple OAuth2 Scopes?

I am configuring a Backend in my Visual Builder web app and I have been issued two scope values by the identity provider. There is only one text box for Scope in the OAuth2 Client Credentials screen when setting up the Backend servers. This should be fine because the specification for multiple scopes is to separate them with a space. I have been able to generate a valid token with two scopes using Postman directly against the token issuing URL.

However, when I put the two values in the Visual Builder backend configuration screen with a space between, it does not successfully retrieve a token. Does anyone know if this is a bug or if there is a different way to delimit the scope values to make it successful? I have tried a comma and %20 but these have not worked.