Send notify working over remote desktop connection, but not locally

I have asked this before, but no response. Asking again: can anyone explain why a pjsip send notify command will work over a vpn or remote desktop connection, but not on a local computer??
I have FreePBX set up on a chromebox as my working set up (which works perfectly in all other respects) and I have it set up (with the same back-up restored, and both up to date) on an old laptop as the backup in case the chromebox fails one day. The situation as described happens on the chromebox, but not on the laptop.

I can’t see any other differences between the 2 instances. The chromebox (the production system) is running FreePBX 14.0.16.11. Asterisk 13.32.0 I’d have to check the laptop for versions.

Yes, that’s fair comment. Sorry for vagueness. The CLI shows that the SIP NOTIFY request has been sent to the specified endpoints, but the endpoints (Yealink extensions) do not appear to receive the message. The weird part is that if I send the request from an RDP the phones do receive the request and reboot.
I don’t have a log to show that at present.

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