Skype for Business 2015

Hello Experts,

Currently I have published my skype for business 2015 with internal domain FQDN and my trial certificate has expired.  Now as per the new norms, the public cert authorities don't provide certificates with internal names anymore.  
So, Im trying to redefine my topology with external FQDN but i get so many errors.  

Im using Skype for business 2015, standard edition.  I tried to build a new topology, with pool FQDN to be external domain FQDN, the sql express automatically chose the instance as server@external FQDN\rtc.  and when I try to publish the topology, I get the following error.
"sql server store is not defined in the topology. You must ensure that the sql server store that is used for the central management store"
I even deleted the configuration store location using the command, Remove-CSConfigurationStorelocation and tried to republish the topology, but still getting a few errors.

Basically I would like to redefine the topology with External FQDN as my certificate holds External FQDN.  It would be good if you can help me with how to proceed.

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Jackie ManIT ManagerCommented:
Skype for Business 2015 is a rebranded Lync Server 2015 and the procedure shall be similar to Lync Server 2013.

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