Follow the steps according to the browser that you are using:

How to turn on Autofill on Oppo devices:

To turn on autofill on an Oppo device, follow the steps below:

1. Go to Settings > Security and Privacy

2. Tap on More security and privacy under Other settings

3. Click on Passwords, passkeys & data services and turn on the toggle for Singpass

Once you have turned on autofill on your device, try logging in again with passkey.

How to turn on Autofill on Xiaomi / Realme devices:

To turn on autofill on a Xiaomi/ Realme device, follow the steps below:

1. Go to Settings

2. Go to Additional Settings > Languages & input

3. Tap on Passwords & accounts and turn on the toggle for Singpass from the list

Once you have turned on autofill on your device, try logging in again with passkey.

How to turn on Autofill on Vivo devices:

To turn on autofill on a Vivo device, follow the steps below:

1. Go to Settings

2. Tap on Users & accounts

3. turn on the toggle for Singpass from the list

Once you have turned on autofill on your device, try logging in again with passkey.