One or more devices are unreachable. Resolve any communication problems before attempting to sync.

SDTechOps, your F5 HA configuration appears to be good.

I think the only problem you have is that you're using the handicapped Trial VE license. It has very limited HA capability or no HA support at all (not sure which applies). The only solution I have for you is a recommendation to obtain a proper F5 VE trial software (non-handicapped) from your F5 reseller - they usually come for free and can be used for as long as 60 days.

Your issue appears to be quite common and has been discussed here:

https://devcentral.f5.com/questions/does-f5-ve-trail-version-113-support-device-service-cluster-dsc-feature

Cheers,