Thank you to those partners who have provided feedback on this issue. While this is still not fully resolved, it appears to be an issue in the cloud between a Microsoft ‘send’ server and a Google ‘receive’ server. One partner has tested this by hot spotting through their phone and this didn’t seem to make any difference, so my previous suggestion about using your Jump demo modem is not likely to be a solution.
One thing we did learn today is that the timeout for the Verification Code is around 5 minutes. So if the email with the verification code doesn’t arrive within 5 minutes, then there is no point in waiting, as the code will have expired. The best strategy is to try again (after 5 minutes). Certainly get your customer to check their spam box while you are waiting; one partner mentioned all three sign ups today went to spam.
The partly good news is that this problem is intermittent and partners have successfully signed up 917 new customers this month, including 53 today (so far).
Digital Inclusion Alliance Aotearoa 
Hi, 95% of the verification code goes to spam, once in a blue moon it goes to their inbox. There is a wait and sometimes the verification code doesn’t come through, as you said a 5 minute wait, sometimes it is down to signal, their phone or a typo error but it does come through…
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