Make sure the Bluetooth speaker is in pairing/discovery mode . It won't show up in Windows if it's already connected to another device.
Settings → Bluetooth & devices → confirm Bluetooth toggle is On
Click Add device → Bluetooth and wait for your speaker to appear
If it doesn't appear within 30 seconds, toggle Bluetooth Off → wait 5 sec → On again
Go to Settings → Bluetooth & devices
Find the speaker → click the three dots (···) → Remove device
Also clear the pairing from the speaker itself (usually hold Bluetooth button for 5–10 sec)
Then re-pair fresh
Right-click Start → Device Manager
Expand Bluetooth
Right-click the Bluetooth adapter → Update driver → Search automatically
Press Win + R → type services.msc → find Bluetooth Support Service → right-click → Restart