skype for business 2019 front end service is never starting
i have win 2019 and on that Skype for business 2019 is isntalled. its a simple setup with only 1 standard front end pool. a ll other services are starting except front end service and it never starts i have tried 2-3 installations on different servers btu on all it stops at hte smae place with HResult: -2147467259 error. so something is totally wrong. has anyone faced it. I m usign on premises version. i even tried to update with the CU update whatever version. but still no luck. windows event log puts a vague event id-12306 A component could not be initialized. The service has to stop.
Component: Live Communications User Services Error code: 0x8007007F(ERROR_PROC_NOT_FOUND) but nothing we could do to fix this service. any help would be appreciated we are stuck for more than 2 months. all DNS, SSL Self signed certificates are all working. since all oher services are running.