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single sign on - Is there a maximum length for NameIdentifier claim values?

We're adding single sign-on to an existing application that now requires a database table to store the external identity values (ClaimTypes.NameIdentifier). We're adding both WSFederation and OpenIdConnect support.

From the documentation I've read and examples I've used within development, there doesn't appear to be a specification for this value.

Currently within development we are receiving non-volatile read-only values from AzureAD that cannot be edited for each user (to prevent re-use, or any amendment if somebody changes their name, etc.) that look similar to this:

http://schemas.xmlsoap.org/ws/2005/05/identity/claims/nameidentifier
P6RFlL7ubzJaGgGfvLcFrGSIu_XCrq4m0nuZvvyNe5w

However, I'm interested to know if tenants can return longer values? To help design the most efficient database/queries, is there a specification/recommendation for this value, particularly it's maximum length?


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