I hope this is seen by others looking for a solution for what you meant.
Mazin and Sammmousa from IRC chat support helped me out, just today.
It was quite easy.
Don't use the {OPTOUTURL}, instead do it manually by using {} in the URL.
https://http//survey.domain.com/optout/tokens/langcode/es/surveyid/{SURVEYID}/token/{TOKEN}
If you want to know your SURVEYID you can do the {OPTOUTURL} so you know the path you will be working with. If you need any help, do not hesitate to contact me back.
Think too all {...URL} can have their @@...URL@@ : please make a Feature request.
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