the first speaker I have from Sony With LDAC audio can't get LDAC playback support from my S10+. On my previous phone the galaxy S9+ I had amazing LDAC support event on 990/Kbits per second. on my galaxy S10+ it doesnt support it. both phones have the exynos chipset.
Make sure your device is connected. Go to BT > Device > Click the settings gear > There should be an LDAC switch at the bottom.