Username being replaced with "Asterisk" in Contact Header

I have been having issues with 2 instances of FreePBX getting circuit busy errors. Voip provider (VOIP.ms) Ran a trace and is blaming the contact header username as a possible problem. They require the contact username to match the SIP username. Here is a copy of the trace

11:57:55 AM [Roy] Session Initiation Protocol (INVITE)
    Request-Line: INVITE [sip:16507408249@sanjose1.voip.ms:5060] SIP/2.0
    Message Header
        Via: SIP/2.0/UDP 45.77.0.11:5060;rport;branch=z9hG4bKPj3b8a5e23-e4d7-4eb4-af07-868c8dd9c708
        From: <[sip:6508971062@45.77.0.11]>;tag=f1ecc1d6-b946-45b0-871e-9c7d04e72a44
        To: <[sip:16507408249@sanjose1.voip.ms]>
        Contact: <[sip:asterisk@45.77.0.11:5060]>
        Call-ID: 7ff43530-477d-4a9f-af63-7576f08a1a78
        CSeq: 23369 INVITE
        Allow: OPTIONS, REGISTER, SUBSCRIBE, NOTIFY, PUBLISH, INVITE, ACK, BYE, CANCEL, UPDATE, PRACK, MESSAGE, REFER
        Supported: 100rel, timer, replaces, norefersub, histinfo
        Session-Expires: 1800
        Min-SE: 90
        Max-Forwards: 70
        User-Agent: FPBX-15.0.17.48(16.19.0)
        Authorization: Digest username="317909_mwsd1", realm="sanjose.voip.ms", nonce="7232da18", uri="[sip:16507408249@sanjose1.voip.ms:5060]", response="fc5e1e48e92f8bbe6bfe6b31af56ae90", algorithm=MD5
        Content-Type: application/sdp
        Content-Length:   335
    Message Body

11:58:05 AM [Roy] still sending the wrong contact header

I have set the username to "317909_mwsd1" everywhere possible in the trunk settings including the optional Auth Username field. No change in the behavior.

Trying to determine if this is a configuration error or a bug. Busy circuits error coincided with very recent updates. Not sure if the Contact username discrepancy has always been the case.