vtech Bad Bluetooth!

I don't think it's me:

For several years, we've had .a vtech telephone set of 3 phones.  Recently, one of the phones failed, so faint as to be inaudible.  So a generous benefactor sent us a replacement phone.  Same brand, same model DS6522.
  The new phone arrived the other day. Just open the package, insert the battery, and we're good.  You'd think, but no.
 First the replacement phone needs to be charged for 12 hours. Okay.  Then
  "Each handset must be registered with the telephone base before use.
    When first purchased and properly charged, each handset shows
 "TO REGISTER HS...and ...SEE MANUAL alternately. Charge the handset before registering it to the telephone base."
1) To register a handset:  Place the new handset in the telephone base.
2) Wait for 10 seconds.  The handset shows REGISTERING...then REGISTERED and you hear a beep when process is completed, about 90 seconds.
  If handset displays FAILED  (and it did)  try the registration process again.

Note: You cannot register a handset if any other system handset is in use.
           If you have not set the date and time for the telephone system, the handset will prompt you to set the date and time after it is registered to the base. To skip setting, press CANCEL.

DEREGISTER HANDSETS
If you want to replace a handset, you must deregister all handsets that are registered to the telephone base.Then register each handset individually.
   TO DEREGISTER ALL HANDSETS, :
      1) Press and hold FIND HANDSET on the telephone base for 10 seconds. (I will add this is etched in small letters in silver on silver behind the phone. BUT I FOUND IT!!  Until the IN USE light turns on and starts flashing.
    2) Immediately press FIND HANDSET again. You must press FIND HANDSET while the IN USE light is still flashing. it flashes for about 5 sec.
   3) All handsets show TO REGISTER HS---and...SEE MANUAL alternately when the deregistration process completes.  Takes about 10 sec to complete.
  You can deregister all handsets even if their batteries are depleted.

        Well, brain fog or not, steps taken necessary or not, and I don't even get all the terminology, though I think the SEE MANUAL icon refers to the vtech manual from the original phone system.
          I THINK THE PHONE SYSTEM MAY BE WORKING.