Order status emails not sending

-- HikaShop version -- : 5.0.4
-- Joomla version -- : 3.10.12
-- PHP version -- : 8.2.18
-- Browser(s) name and version -- : Edge
-- Error-message(debug-mod must be tuned on) -- : Error 500: SMTP Error: data not accepted.SMTP server error: DATA END command failed Detail: 4.4.62 Mail sent to the wrong Office 365 region. ATTR35. For more information please go to go.microsoft.com/fwlink/?linkid=865268 [ValidationStatus of '' is EmptyCertificate] [LO1PEPF000022FE.GBRP265.PROD.OUTLOOK.COM 2024-04-26T21:26:54.635Z 08DC62A6D51436EF] SMTP code: 451

I have had to update my email configuration as MS changed my settings. I now have to provide a different address, different port and do not need to provide authentication. I have updated the website, servers etc without any problems.
However HikaShop order status update is throwing an error.
I have sent email to a test user from the HikaShop Customer screen with no problems. But if I send order status notification updates, I get the error the mail has been sent to the wrong Office 365 region.
I have the email configuration setup with the relevant from and reply to emails. I have taken these settings out to use the default joomla address, but this made no difference. I do not have any additional email settings in the order status notification settings.
Please advise, why this area does not work any more.

My client started using 365 cloud and routed all their email through it. I have been unsuccessful in getting Joomla to connect properly with it. My solution is to use Gmail for my SMTP provider and route the Joomla website to send out emails using this. It works well.
This may be a fallback solution if all else fails.
I just thought I would pass along this tip for others having issues with 365.