Vapi call Transfer not working

Hi , can anyone please help me with vapi call transfers? I tried the resources in YouTube but to no avail.
Issue is that the call gets an error when the assistant is on the transferring phase already. there is 1 beep then error message pops up. i tried creating another assistant, and also tried changing the numbers for call forwarding but I'm not receiving any calls. Im Using Vapi free number on this account. your inputs would be much appreciated. thank you!
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