How d I pass credentials to the TURN server

[RussOggi255]

I have deployed a STUN/TURN server and if I test from https://www.metered.ca/turn-server-testing?ref=metered.ca everything looks OK and if I check the logs on my TURN server I see the username is passed in;
6: : session 000000000000000001: realm user : incoming packet ALLOCATE processed, success

If I run the app after setting DdefaultSignallingServerURL and defaultIceServer, the signalling status says not connected and in my server logs I see no user;

session 001000000000000003: closed (2nd stage), user <> realm origin <>, local 0.0.0.0:3478, remote MY.IP.ADDRESS.x:59620, reason: general

So where do I set the username/password?