Hm, can you clarify what makes you think this to be true?  I'm not
   doubting you, but I'd love your help reproducing your findings so I can
   fix it.  Can you give me a command that shows this?  Curl seems happy
   with the cert:
   $ curl -I [1]https://Expensify.cash
   HTTP/2 200
   date: Sun, 24 Jan 2021 21:15:07 GMT
   content-type: text/html
   set-cookie: __cfduid=d7b9d388659eddf76d49a3180052be5851611522907;
   expires=Tue, 23-Feb-21 21:15:07 GMT; path=/; domain=.expensify.cash;
   HttpOnly; SameSite=Lax; Secure
   last-modified: Fri, 22 Jan 2021 19:48:30 GMT
   x-amz-version-id: gDUIKS4512FilAV451eNAB1GKNTXSwxR
   accept-ranges: bytes
   x-cache: Miss from cloudfront
   via: 1.1 [2]da5952aa802df39905ceb16592e9698a.cloudfront.net
   (CloudFront)
   x-amz-cf-pop: HIO50-C1
   x-amz-cf-id: eUX6h4RJEibwWOZlO9fRhI8qqXnOL-cCXKuV-NOcx87ifCjPYNWLGQ==
   cf-cache-status: DYNAMIC
   cf-request-id: 07d7d93449000039a2a6278000000001
   expect-ct: max-age=604800,
   report-uri="[3]https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-
   ct"
   server: cloudflare
   cf-ray: 616cc49a0c4839a2-SEA
   Also, can you answer any of my questions about Signal?  Thanks for your
   help and the fast response!
   -david

   On Sun, Jan 24, 2021 at 1:14 PM professor rat <[4]pro2rat@yahoo.com.au>
   wrote:

     This site can’t provide a secure connection
     expensify.cash. uses an unsupported protocol.
     ERR_SSL_VERSION_OR_CIPHER_MISMATCH
     Unsupported protocol
     The client and server don't support a common SSL protocol version or
     cipher suite.

References

   1. https://Expensify.cash/
   2. http://da5952aa802df39905ceb16592e9698a.cloudfront.net/
   3. https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct
   4. mailto:pro2rat@yahoo.com.au