by Ken Task.
In the Moodle 'Store', there are two plugins for saml2:
https://moodle.org/plugins/?q=saml2
which one are you using?
As far as tokens ... in a 3.3.highest and probably above:
https://yoursite/admin/settings.php?section=webservicetokens
Those are one of those things that require locating parts required not in one location. :\
'spirit of sharing', Ken