What caused Veam Agent to fall into an error during backup?

Question

Backup

I encountered such a problem when trying to perform a backup task in Veam, an error began to appear:

12/14/2020 19:31:42 :: Error: The device is not ready. Asynchronous read operation failed Failed to upload disk. Agent failed to process method {DataTransfer.SyncDisk}. Exception from server: The device is not ready. Asynchronous read operation failed Unable to retrieve next block transmission command. Number of already processed blocks: [0]. Failed to download disk.

I found a similar situation on the veam forums, one of the solutions:

On the agent machines, add HKEY_LOCAL_MACHINE\SOFTWARE\Veeam\Veeam Endpoint Backup\ManagedExcludeVolumes (REG_MULTI_SZ) and add the volume as the value. eg HKLM\SOFTWARE\Veeam\Veeam Endpoint Backup\ManagedExcludeVolumes=\\?\Volume{b80b6e86-a7aa-4e89-8fb6-789e24055c1d}\. Restart the Veeam agent.

I registered the value of the parameter with my problematic section in the registry and did not help. Somewhere in the topics it was mentioned that the problem appeared after updates.
I wanted to understand whether I somehow configured it incorrectly or this is a compatibility problem of the agent with some updates from Microsoft.