Thank you so much to both of you for your answers! It's very appreciated.
I did more tests and I still can't get this to work. I get the same result: 
I get sent to CAS from Atlassian, I enter my credentials, and then I dont 
get sent back to Atlassian, I'm stuck in CAS. The message says that I see 
this page because CAS doesnt know my final destination.
I installed samltracer as suggested to try and find my mistake but I can't 
see it :(.

Here is my metadata file:

<?xml version="1.0"?>
<md:EntityDescriptor xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata" 
validUntil="2024-11-03T19:47:00Z" cacheDuration="PT604800S" 
entityID="https://auth.atlassian.com/saml/b87b0545-cb70-4fe0-8c96-61034fefb7cc";>
  <md:SPSSODescriptor AuthnRequestsSigned="false" 
WantAssertionsSigned="false" 
protocolSupportEnumeration="urn:oasis:names:tc:SAML:2.0:protocol">
    <md:KeyDescriptor use="signing">
      <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#";>
        <ds:X509Data>
          
<ds:X509Certificate>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</ds:X509Certificate>
        </ds:X509Data>
      </ds:KeyInfo>
    </md:KeyDescriptor>
    <md:KeyDescriptor use="encryption">
      <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#";>
        <ds:X509Data>
          
<ds:X509Certificate>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</ds:X509Certificate>
        </ds:X509Data>
      </ds:KeyInfo>
    </md:KeyDescriptor>
    
<md:NameIDFormat>urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress</md:NameIDFormat>
    <md:AssertionConsumerService 
Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" 
Location="https://auth.atlassian.com/login/callback?connection=saml-b87b0545-cb70-4fe0-8c96-61034fefb7cc";
 
index="1"/>
  </md:SPSSODescriptor>
</md:EntityDescriptor>


And here is the request I see using saml-tracer:

<saml2p:AuthnRequest xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol" 
AssertionConsumerServiceURL=
"https://auth.atlassian.com/login/callback?connection=saml-b87b0545-cb70-4fe0-8c96-61034fefb7cc";
 
Destination="https://cas6dev.polymtl.ca/cas"; ID=
"_c59ebaed7f8b7fbc8dd55d5b0afb84fb" IssueInstant="2024-11-15T15:59:41.525Z" 
ProtocolBinding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Version=
"2.0" > <saml2:Issuer xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">
https://auth.atlassian.com/saml/b87b0545-cb70-4fe0-8c96-61034fefb7cc</
saml2:Issuer> <saml2p:NameIDPolicy AllowCreate="true" Format=
"urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress" /> </
saml2p:AuthnRequest> 
Can you see any obvious mistake I am making?

Le mardi 5 novembre 2024 à 23:38:01 UTC-5, Ray Bon a écrit :

> Neon,
>
> The Location and Binding protocol must match what is sent in the request.
> You can use a browser plugin like samltracer to see what the 
> request/response looks like.
> Also check cas logs.
>
> Ray
>
> On Tue, 2024-11-05 at 10:44 -0800, Neon Dazzle wrote:
>
> You don't often get email from [email protected]. Learn why this is 
> important <https://aka.ms/LearnAboutSenderIdentification>
>
> Thank you so much for your answer.
> I created the metadata file using a web service and added:
>
>     <md:AssertionConsumerService
>                         index="1"
>                         
> Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST"
>                         Location="https://atlassian.start.com"; />
>
> I'm still getting no redirection and I stay on the CAS website.
>
> Le lundi 4 novembre 2024 à 13:38:22 UTC-5, Ray Bon a écrit :
>
> Neon,
>
> ACS is required in metadata. 
> You can create the metadata file if the vendor does not supply it. There 
> are some online services that will help.
>
> Ray
>
> On Fri, 2024-11-01 at 12:17 -0700, Neon Dazzle wrote:
>
> You don't often get email from [email protected] why this is 
> important <https://aka.ms/LearnAboutSenderIdentification>
>
> Hi everyone, we have CAS6 and are trying to setup SSO with our Atlassian 
> org on the cloud. It seems like we almost have it, we get redirected to CAS 
> and the login works, but we can't get redirected to Atlassian after, we are 
> stuck in CAS.
> It seems like there is not json parameters for redirection so I'm 
> wondering where we should put the ACS adresse given by Atlassian.
> All our other services connected with CAS provide metadata files so it's 
> easy, but Atlassian doesnt provide that.
> Has anyone been able to setup SSO with Atlassian Cloud?
>
>
>

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