Unable to Import Custom Cert

I have two GL-RM1PE running V1.8.0 release1 that are great, but I’m running into an issue when trying to deploy a TLS cert. I’ve successfully created a CSR with openssl and obtained a valid cert from Comodo, but I’m getting a “TLS certificate setup failed, please check the certificate content and key.” error when I go to import the custom cert. I suspect, though I cannot verify, this is related to a mismatch in the common name/FQDN of the device, as I cannot set a DNS suffix other than .local in the web GUI. Is there any way to confirm this is what’s causing my issue and, hopefully, a workaround for this in the terminal?