May 2021 Gateway Error: SharePoint: Request failed: The underlying connection was closed.

I've had a ticket in with Microsoft for three weeks and I am not making much progress with them.  I have done 100% of the troubleshooting so far, and you all are correct, its related to the TLS changes on SharePoint.  I found this article (https://docs.microsoft.com/en-us/sharepoint/troubleshoot/administration/authentication-errors-tls12-support#summary) so I wonder if you all are facing an issue with the cipher suites?  You can use a really convienent tool called IIS Crypto to check and/or change your TLS/cipher suites.  

A note to Microsoft, this is getting fairly ridiculious that you're not acknowledging this issue and helping to resolve it.