Your snippet shows that the ERRORMSG: Directory /u01/oracle/PREPROD/fs_ne/EBSapps/patch/21832708 does not exists. Can you please check that.
"ERRORMSG: Directory /u01/oracle/PREPROD/fs_ne/EBSapps/patch/21832708 does not exists."
The error message indicates that you have removed/deleted the Patch directories from the PATCH_TOP.
Copy the patches back to the PATCH TOP and retry.
the patch is password protected and Oracle does not allow me to download it.
As per Oracle documents, "The directories where you extracted the patches applied in a given patching cycle must be retained, in the same location and with the same contents, until the next prepare phase completes. This is also a requirement for patches applied in a hotpatch session."
So in your case, your content is missing and as per my understanding, you have two options now
1. Raise a SR and get the password to download the patch and place it in the patch_top directory.
2. Abort the patching cycle and then run fs_clone(This is not recommended at first place)