Azure Managed Instance manual backup to Storage container

Question

I am migrating to Azure Managed Instance. Once there, I have to be regularly refreshing the lower environments from production. My script to take a manual .bak to a storage container is failing.

I am connect to the managed instance from a jumpbox.
I created a container into a storage.
I created the credential on the managed instance from the SSMS on the Jumpbox

When I try to take a backup with the command below, it fails.
When I try to use the SSMS backup wizard, I can see the container on the connect to a Microsoft Subscription screen. I can create and generate a shared access signature. But when I click OK, the wizard does not populate the signature into the Select Backup Destination screen.

Msg 3201, Level 16, State 1, Line 13
Cannot open backup device 'https://vuedvucexmdevmigrationsa.blob.core.windows.net/devbackuparchivetestilde/ItemGroupDevOld20200824.bak'. Operating system error 50(The request is not supported.).
Msg 3013, Level 16, State 1, Line 13
BACKUP DATABASE is terminating abnormally.

Answer 1

It worked. I tried the wizard and it worked. I do not know why.

But I realized that the TO URL = is expecting a NVarchar

BACKUP DATABASE databasename
TO URL = N'https://storageaccountname.blob.core.windows.net/containername/filename.bak'
WITH COPY_ONLY;