Windows 10 Bluetooth virtual serial comm port is missing

Question: How to get linked Bluetooth serial Commport installed? For communication a serial comm port is needed. But on some computers, mainly workstations, there is no linked Bluetooth COM LPT with COMx . For best comparison we tested on 2 Notebooks. Both from Dell. Both with Windows 10. Both with the same USB Bluetooth dongle. Both paired with same mobile device. First Laptop lists all Serial Commports and its working fine. ( nothing additional manually installed ) Second Laptop has Bluetooth but no serial Commports. ( how to install? ) We checked the registry but could not find a relevant e

Question by Tib Schott on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.