If none of the above steps resolve your issue, then you may open a support call with Veeam. Information for contacting Veeam Support and support policy guide are available at the Customer Center Portal at cp.veeam.com.
Note that you will need to produce a .zip file of diagnostic data to send to Veeam support, as described in Viewing and Exporting Logs. Attach this file to your support request with the problem description.
If the log files are too large to attach, email the support address, and an alternative delivery method will be agreed (such as FTP upload).