I get this error when using FTP cloud backup:
The remote FTP is accessible, not login issues, the user has full control.
Works fine with Legacy jobs.
Just a new jobs fails with this:

2023-12-05 12:01:40,976 [PL] [1] INFO - DiskImageInstanceWrapper.RunEarlyGettingDiskInfo
2023-12-05 12:01:41,205 [PL] [1] INFO - DiskImageInstanceWrapper waiting completed
2023-12-05 12:01:41,917 [PL] [1] INFO - DiskImageInstanceWrapper.RunEarlyGettingDiskInfo
2023-12-05 12:01:42,148 [PL] [1] INFO - DiskImageInstanceWrapper waiting completed
2023-12-05 12:01:43,172 [PL] [1] NOTICE - LogFilePathPart.UploadFile: Starting uploading LOG file
2023-12-05 12:01:43,191 [PL] [1] INFO - Backup log file not uploaded to storage; Code - 2508
2023-12-05 12:01:43,193 [PL] [1] ERROR - Failed Upload Backup Log File was created by
System.Exception
Unable to upload log file \CBB_SBA\CBB_Archive\a0d407b6-ddea-48ae-927b-74024417d506\GEN-000000-5948bbce-7497-4fcd-a047-2292ab6e713b\20231205100135_000000_F\$LOG$
at akA.A(agS , Stream , aAG , ICancelable )
at Cn.A(String , ICancelable )
System.NotImplementedException
ISmartHeadersCompliant
at aXh.ro(Stream , DateTime , aUe , arB )
at aAh.aAj.A()
at aAh.aAi.A()
at aAh.aAJ.A()
at aAh.CreateFile(aKN , Stream , ICancelable , aAg )
at akA.A(agS , Stream , aAG , ICancelable )