I cannot add user to the discouse forum from a wordpress website when user added in a membership

[Firepup650 (Firepup Sixfifty)]

@Haseeb_Ahmed

$group_names = array("volunteers", "moderators");

I think that’s supposed to be a comma-separated string, not an array:

@Manage group membership in Discourse with WP Discourse SSO

$group_names: a comma separated list of Discourse group names (with no spaces between names.)