WinRS/WinRM can't access UNC path with CredSSP (Double-Hop) - winrm

Question

I am trying to access a shared folder using unc path on server2 from clientX via WinRS to server1.
clientX -> server1 -> server2
My issue is basically the same as Can WinRS access UNC paths?
However, the solution there does not work for me although I followed all available instructions regarding WinRM and CredSSP configurations on clientX and server1 and it appears that everything was done as intended.
hostname of clientX is 'clientX' (acquired from cmd command 'hostname')
full computer name of clientX is 'clientX' (acquired from control panel > system)
user domain of clientX is 'CLIENTX' (acquired from cmd command 'echo %userdomain%')
hostname of server1 is 'server1' (acquired from cmd command 'hostname')
full computer name of server1 is 'server1' (acquired from control panel > system)
user domain of server1 is 'SERVER1' (acquired from cmd command 'echo %userdomain%')
the unc path on server2 is \SERVER2\sharedF\test
on server1, I can successfully run the command:
dir \\SERVER2\sharedF\test
on clientX, I can successfully run the command:
dir \\SERVER2\sharedF\test
aswell (as it also is connected to server2 directly).
on clientX, I can successfully run the command:
winrs.exe -r:http://SERVER1:5985 -u:adminOnserver1 -p:pass4server1 "dir c:"
on clientX, I fail to run the command:
winrs.exe -r:http://SERVER1:5985 -u:adminOnserver1 -p:pass4server1 "dir \\SERVER2\sharedF\test"
as I get the error message "access is denied". And that is the problem.
on clientX, the power shell command "Get-WSManCredSSP" returns:
The machine is configured to allow delegating fresh credentials to the following target(s): wsman/SERVER1
This computer is not configured to receive credentials from a remote client computer.
on clientX, the cmd command "winrm get winrm/config" returns:
Config
MaxEnvelopeSizekb = 500
MaxTimeoutms = 60000
MaxBatchItems = 32000
MaxProviderRequests = 4294967295
Client
NetworkDelayms = 5000
URLPrefix = wsman
AllowUnencrypted = true
Auth
Basic = true
Digest = true
Kerberos = true
Negotiate = true
Certificate = true
CredSSP = true
DefaultPorts
HTTP = 5985
HTTPS = 5986
TrustedHosts = 200.0.0.145,CLIENTX,200.0.0.159,SERVER1
Service
RootSDDL = O:NSG:BAD:P(A;;GA;;;BA)(A;;GR;;;IU)S:P(AU;FA;GA;;;WD)(AU;SA;GXGW;;;WD)
MaxConcurrentOperations = 4294967295
MaxConcurrentOperationsPerUser = 1500
EnumerationTimeoutms = 240000
MaxConnections = 300
MaxPacketRetrievalTimeSeconds = 120
AllowUnencrypted = false
Auth
Basic = false
Kerberos = true
Negotiate = true
Certificate = false
CredSSP = false
CbtHardeningLevel = Relaxed
DefaultPorts
HTTP = 5985
HTTPS = 5986
IPv4Filter = *
IPv6Filter = *
EnableCompatibilityHttpListener = false
EnableCompatibilityHttpsListener = false
CertificateThumbprint
AllowRemoteAccess = true
Winrs
AllowRemoteShellAccess = true
IdleTimeout = 7200000
MaxConcurrentUsers = 2147483647
MaxShellRunTime = 2147483647
MaxProcessesPerShell = 2147483647
MaxMemoryPerShellMB = 2147483647
MaxShellsPerUser = 2147483647
on server1, the power shell command "Get-WSManCredSSP" returns:
The machine is not configured to allow delegating fresh credentials.
This computer is configured to receive credentials from a remote client computer.
on server1, the cmd command "winrm get winrm/config" returns:
Config
MaxEnvelopeSizekb = 500
MaxTimeoutms = 60000
MaxBatchItems = 32000
MaxProviderRequests = 4294967295
Client
NetworkDelayms = 5000
URLPrefix = wsman
AllowUnencrypted = true
Auth
Basic = true
Digest = true
Kerberos = true
Negotiate = true
Certificate = true
CredSSP = true
DefaultPorts
HTTP = 5985
HTTPS = 5986
TrustedHosts = 200.0.0.145,CLIENTX,200.0.0.159,SERVER1
Service
RootSDDL = O:NSG:BAD:P(A;;GA;;;BA)(A;;GR;;;IU)S:P(AU;FA;GA;;;WD)(AU;SA;GXGW;;;WD)
MaxConcurrentOperations = 4294967295
MaxConcurrentOperationsPerUser = 1500
EnumerationTimeoutms = 240000
MaxConnections = 300
MaxPacketRetrievalTimeSeconds = 120
AllowUnencrypted = false
Auth
Basic = false
Kerberos = true
Negotiate = true
Certificate = false
CredSSP = true
CbtHardeningLevel = Relaxed
DefaultPorts
HTTP = 5985
HTTPS = 5986
IPv4Filter = *
IPv6Filter = *
EnableCompatibilityHttpListener = false
EnableCompatibilityHttpsListener = false
CertificateThumbprint
AllowRemoteAccess = true
Winrs
AllowRemoteShellAccess = true
IdleTimeout = 7200000
MaxConcurrentUsers = 2147483647
MaxShellRunTime = 2147483647
MaxProcessesPerShell = 2147483647
MaxMemoryPerShellMB = 2147483647
MaxShellsPerUser = 2147483647
on server1, the cmd command "winrm e winrm/config/listener" returns:
Listener
Address = *
Transport = HTTP
Port = 5985
Hostname
Enabled = true
URLPrefix = wsman
CertificateThumbprint
ListeningOn = 127.0.0.1, 169.254.229.41, 200.0.0.159, ::1, fe80::5465:9195:eabb:b7e7%11, fe80::c056:f6db:8f7f:e529%9
Did I do anything wrong? Any ideas?
I followed the common, basic instructions from microsoft and the solution from Can WinRS access UNC paths? and used commands like "Enable-WSManCredSSP -Role "Server"" , "Enable-WSManCredSSP -Role Client -DelegateComputer SERVER1", "winrm quickconfig".