I just updated the wiki to MediaWiki 1.39 and realized that the extension is not working at all. I am not presented with any user agreement to accept, neither for new nor for existing accounts. Even when setting $wgUserAgreement_DaysToReaccept = 0;
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Topic on Extension talk:UserAgreement
I am talking about https://www.mediawikiwidgets.org/ I run for the community. I will disable the Widgets extension for now to avoid privacy problems.
I just switched to using ConfirmAccount since this allows me to enforce acceptance of terms. However, this one is not a self-service extension.