After IVR calls not transferinf to extensions

Asterisk Version: 13.17.0

FreePBX 13.0.192.18

When we call our external number. after Ivr message we not able to transfer calls.
we have three same version server at different location. all have same issue. Please suggest

Dialing external number - IVR-ext# not working…
Dialing external number - IVR-ext working…

Pressing # is not working…