The following dialog comes up when starting P&ID:
Title: Solid Edge 2019 P&ID
Message: No license key found !
Do you want to start in demo mode, where the number of symbols and pages are limited?
Solution A machine where this error occurred had View and Markup installed, which is a 32 bit application. Because of this, "AddinLM" was using the View and Markup license file and hence the error. Uninstalling View and Markup product resolved the issue.
Hardware/Software Configuration Platform: INTL64
OS Version: 10_1803