Depending on your hardware, you can find the necessary drivers through the following methods: Official Manufacturer Support

Have you tried plugging the dongle into a (e.g., in the back of the PC)?

Corrupted configuration data can prevent a driver from functioning normally. A clean reinstall wipes the slate clean.

A significant number of users who purchased 75270 dongles, especially from online marketplaces, discovered that despite being advertised as "Bluetooth 5.0", they actually only support Bluetooth 4.0. You can verify your dongle's true version on Windows: