all my clients have this problem when try to booking a service.

“The email already exists under another name. Check the name in no.”

how do i remove this operation

Hi Marius!

This message appears if the same E-Mail adress is used, but with different name or phone numbers.

In the general setting of Amelia under Role settings > Customer there should be a field "Check customer's name for existing email/phone when booking"

You can simply deactivate this checkbox and the system does not check against the E-Mail adress of the user.