FaceTime 36(36) with Tahoe26.1, connection to old iPad impossible

FaceTime with Tahoe26.1 on my MacBookPro now not connects to FaceTime on my old iPad and reverse, makes no sound by calling tries, says "Missed call", but there is no possibility to say "accept call". Looking at the connecting details I can see, that on iPhone address now are cut all "." and "@" as seen in contacts (seems to be allowed only numbers now), and too the little window in contact details is not able to scroll down - changing tries go to the contacts, but there all seems correct. Yesterday evening I could make normal connections with FaceTime. Is there a possibility or need to update FaceTime (and how to do?)? With my MacBookPro I was not able to get Video connections since months but Audio was ok.