Transfer only collect 1 digit (not the transfer app)

I’ve been trying to use the built in blind transfer (or the assist transfer) with features.conf in combination of option “T” and/or “t” in Dial app. But the weird thing is no matter who initiate the transfer (and either blind or assist), it seems asterisk (version 11) will only collect 1 digit and then try to sent the call out. So how do I make asterisk collect more then 1 digit? I don’t see some sort of max digit(s) parameter in the features.conf

Something I’ve overlooked?

Thx in advance.