Hi @alexliii,
Wordfence 2FA feature setting is only available at the backend dashboard screen of WordPress. That’s why when a user register as a customer/subscriber, they do not find the way to setup the 2FA, as WooCommerce prevent customer/subscriber user role to redirect to the WordPress Dashboard. So, they cannot setup 2FA and due to required setting of Wordfence, they failed to login.
In that case, either you can change the 2FA setting to optional, or you can disable the feature for those userrole.
On the other hand, you can follow the @aurangajeb suggestion. But I could not get your recent problem that the google icon is showing on every page.
However, from you first screenshot error message it looks like you have enabled the Dokan Email Verification feature.
The Email Verification is a premium feature of the Dokan plugin, and as per the www.remarpro.com rules, commercial products are not supported here.
If you are a premium user of the Dokan plugin, you can contact us through the proper channel for futher information.
Thanks!