Amazon echo, Amazon tap and Epson wireless printer no longer recognize xfinity router password

Nothing has changed on the WiFi network password.   All other devices, including smart devices connect just fine to WiFi, all of a sudden, 3 devices stopped communicating.  After many weeks of going through all setup, recommended solutions, still unable to resolve the ‘incorrect’ password on these devices.  Password and connection is just fine with using either iPhone hotspot or Verizon jet pack.  Checked admin site for router, found 2 of the devices were listed, but blocked by tcp.  Removed them from the list, and still unable connect with same error of ‘incorrect password’.  Extremely frustrating - unable to speak to anyone in support.  This is an attempt to reach out for help.  I am a retired IT professional and need some insight into this problemm. Thanks in advance for any help!