Replication between ex2100 and ex4100 on same network - not working

Ex2100 firmware 5.26.119
Ex4100 firmware 5.26.119

Confirmed UpnP is enabled on my verison G3100 router
I setup ssh port forwarding 22 and port forwarding Remote Backups 873 (current setup both devices are on my local network so this to my knowledge is not required - but i will in the future)

Setup sync job and it creates but nothing happens. the jobs is just hung, no errors.

Not sure what i am missing? Anyone has any Ideas

Hi @Roland_Williams,

Have you opened a Support Case? If not opened, for more information, please contact the WD Technical Support team for the best assistance and troubleshooting:
https://support-en.wd.com/app/ask

Yes i have opened a case with support, checking there recommendations. thanks