Recently trying to upload some SOBR backups using Veeam and randomly all the backups would fail with

15/12/2020 11:52:34 AM :: The TLS version of the connection is not permitted on this storage account.
Shared memory connection was closed.

Fix

Add the following registry key : 

HKEY_LOCAL_MACHINE\SOFTWARE\Veeam\Veeam Backup and Replication\

Dword Name : AzureConcurrentTaskLimit

Value : 1