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I've sent an email to the cathedral and they gave me the same reply as in the link so I'm sure it'll be fine on Sunday. I'll update this post to confirm.
Edit: picked up the credential today (Sunday) from the lady at the door.
True! That answers my question.
I've just seen this thread which confirms your advice: https://www.caminodesantiago.me/community/threads/credencial-in-lisbon.78355/
What is this other source? My only day in Lisbon will be a Sunday and the Sé appears to be closed to visitors so not sure where I'll pick up the credencial.
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