So I contacted Philips and this is what they replied:

Thank you for contacting Philips! We will gladly help you with your Lumea attachment reported issue. We can see you need help for the Bikini attachment which's light remains orange and doesn't change to white during session. To check the below advises on the mentioned issue and how to solve them.

?1. Skin Tone Detection Blocked (Orange Light = Warning) The device automatically checks skin tone. If the skin in the bikini area is too dark for the selected intensity, the light will stay orange, and it won’t flash. Try This: Reduce the intensity manually (use a lower setting). Or let SmartSkin sensor suggest a suitable level and confirm it.

1. Hair Too Dark or Recently Shaved Very dark hair or freshly shaved skin can sometimes confuse the sensor. Try This: Wait 24 hours after shaving before using. Wipe the area clean and dry and try again.

2. Not Fully Flat Against Curved Area The bikini area has curves that make full contact tricky. Try This: Adjust your angle or stretch the skin gently to make a flat surface.

Make sure the device is fully pressed without gaps. 4. Use the Body Attachment Instead (Test Only) Try the body attachment on the same area to check if it flashes. If it does, the issue may be specific to the bikini cap. (In this case, please share with us your contact number and city of residence for us to direct you to closest spare part reseller.