Trouble with pairing of IPhone 7 to home Panasonic phone.

I have a Panasonic KX-TGF370 wireless home phone that is

designed to link a up to 2 cell phones to the landline phone as well as

transfer cell phone contacts. My iphone 7 Plus recognizes the device, however,

doesn't ask for a pin number, the following message appears: "Pairing

Unsuccessful Make sure Panasonic TECT' is turned on, in range, and is ready to pair. I have reset the phone, and followed every

diagnostic and instructional procedure as given through Panasonic

Telephone Support and the Operating Instruction Manual. The iPhone 7 Plus

is listed by Panasonic as a compatible bluetooth enabled cellphone. The

phone is ready to pair, the pin number is correct and my iPhone sees

the device, so wht won't they pair? Panasonic Support thinks there is

something wrong with my iPhone, which is currently running iOS 12.3 and

pairs perfectly to my Acura bluetooth in my car.