Symptoms
You get error Unable to get local issuer certificate. <20> when starting published apps:

When you click View Certificate... you see that it's issued from a proper 3rd Party CA and no errors are shown:

Cause
The Parallels Client installed is outdated and is not aware of the root CA in the certification chain.
Resolution
Please update Parallels Client to the most recent version.
You can use Client Policies in RAS Console to force the upgrade:

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