Hello Eleni,
This is a recent problem. It is current, happening right now. Microsoft Outlook, not in the App, but in a web browser online. Needs to be addressed. Settings are correct, haven't changed them in years. Mission critical for business, don't have time for these kinds of errors. As a former MS OEM system builder and a MS user for 30 years with an original Hotmail account, I expect better. Please fix it. It shouldn't require even one input from the user.
Best Regards,
Kelvin Reed