Thanks everyone for there help with this but in the end I had to go to Microsoft.
There answer is below but for some reason it is cutting off part of the information:
Solution
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Ran the command using Exchange Management Shell to fix the Outlook Anywhere settings:
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Get-OutlookAnywhere | Set-OutlookAnywhere -ExternalHostname webmail.bancroft-linings.com -ExternalClientAuthenticationMethod NTLM -ExternalClientsRequireSsl $true -InternalClientsRequireSsl $true
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Externally webmail.bancroft-linings.com is published and we do not have the URL webmail.bancroft-linings.com present in the SSL certificate
Hence created new self-signed certificate using Exchange Management Console including the server Netbios name, webmail.bancroft-linings.com, autodiscover.bancroft-linings.com
Deployed new SSL certificate using Group Policy so that domain users will not face any issues
Assigned IIS service to the new SSL certificate
Deleted the CNAME record in external DNS for autodiscover.brancroft-linings.com
Created SRV record for autodiscover.brancroft-linings.com
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_autodiscover._tcp.bancroft-linings.com SRV service location:
priority = 10
weight = 10
port = 443
svr hostname = webmail.bancroft-linings.com
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Fixed the ExternalUrls for OAB, OWA, EWS, Microsoft-Server-ActiveSync and pointed it to webmail.bancroft-linings.com using Exchange Admin Center
On external Outlook client machine installed the self-signed SSL certificate first
Now connected Outlook using Autodiscover and it connected automatically without any issues
Post above steps issue stands resolved
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Marked as answer by
alamb200
15 hours 50 minutes ago