Restic backup.ps1 and sftp with NO-IP address

[LMSDF]

Hi there
I have a problem with this script and i dont know what can be
I can :
C:\restic>restic.exe -r sftp:osmc@lmfaustino.ddns.net:/home/osmc/lmfaustino backup c:\Intel
enter password for repository:
repository 98822536 opened (version 2, compression level auto)
created new cache in C:\Users\Luis Faustino\AppData\Local\restic
no parent snapshot found, will read all files

Files: 4 new, 0 changed, 0 unmodified
Dirs: 4 new, 0 changed, 0 unmodified
Added to the repository: 149.354 KiB (12.905 KiB stored)

processed 4 files, 147.127 KiB in 0:02
snapshot 5f92352c saved

But when i change $Env:RESTIC_REPOSITORY='sftp:osmc@lmfaustino.ddns.net:/home/osmc/lmfaustino' on script it failed with message:
PS C:\Windows\system32> C:\restic\backup.ps1
[[Backup]] Failed - cannot access repository.
[[Backup]] Sleeping for 15 min and then retrying...
[[History]] Backup success rate: 38 / 51 (74,51%)

Can any one help!!!