Outlook autodiscovery not working in Windows 7

 Recently stuck with interesting problem.

Using same credentials with outlook 2010 on Windows 7 and Windows 10 a have different result in autodiscovery.

All working like a charm on Windows 10 and always failing on windows 7 with error 0x800C8203.

At the end i figured that my Exhange 2019 server based on Windows 2019 server, with newest IIS not suppported TLS 1.

And outlook on windows 7 not supporting higher protocols like TLS 1.2

So you have to options how to resolve this probles

1. Add TLS 1.2 support to Windows 7 ( failed  for me)

2. Enable TLS 1 suuport on iis with this great software https://www.nartac.com/Products/IISCrypto/

Second option worked for. Yes it is insecure but we have what we have, when deadline already passed :)