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Hello Arvid, you can migrate Social sign-in connections like so: <https://www.ory.sh/docs/kratos/manage-identities/import-user-accounts-identities#social-sign-in-connections>
The endpoint used is the same as when <https://www.ory.sh/docs/kratos/manage-identities/create-users-identities|creating identities>, you just add the credentials field.

i'm confused what subject is in case of github. it's the numeric user id, right?

when using that i'm getting {{"error":{"code":500,"status":"Internal Server Error","request":"6b52ac51-9cf3-9bae-9be9-4818656aab5b","message":"uuid: incorrect UUID length 0 in string \"\""}}