There is a known issue with SentinelOne Agent 23.2.3.358 installed on a domain controller, which causes backups in Veeam for those machines to fail. The following error is displayed:
This is caused by the boot protection feature of SentinelOne. One possible workaround is to disable this until a fix can be provided by either Veeam or SentinelOne.
cd "C:\Program Files\SentinelOne\Sentinel Agent 23.2.3.358" .\SentinelCtl.exe config safeBootProtection false -k "PASSPHRASE"