> In all of my testcases the NameQualifier was set to the issuer of the 
> AuthnRequest, which is the SP.
> Thats why the Shibboleth SP ignores the subject ID.

Judging by the spec, at least for "persistent" identifiers,

> In the case of an identifier with a Format of 
> urn:oasis:names:tc:SAML:2.0:nameidformat:persistent, the NameQualifier 
> attribute MUST contain the unique identifier of the identity provider that 
> created the identifier.

So yes, this seems wrong.

> My quickfix would be the use the entityId of the IdP, but that will not 
> handle relying IdPs.

Don't follow the last bit. What do you mean "relying IdPs"?

You'll need to account for entity ID overrides as well on per a SP
basis; may or may not be that quick.

> Is it a bug? Should I open a PR?

Sure.

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