Xfinity email - When I type in the name of any of several groups (that display O.K.) in the email "To" field, the names are not added to the email address field nor does the name appear in the drop down list (it is blank). When I click on the typed in group name and "send" I get an error "invalid email name". I have created a new group with a known correct address (mine) to see if it's an address error in the group and it (or any other group) still doesn't work. The group feature has worked fine until today and I have not knowingly changed anything. If I go to the email address book and click on a group, all the correct names and addresses are listed. I can click on "new email" in the address book and the group addresses show up in the new email and sends correctly. Individual names can be typed into the "To" block and it appears as it should.