Configuration check warning:
The TS setup variable plugin.tx_onetimeaccount_pi1.groupForNewFeUsers contains the value 5 which isn't valid. This value specifies the FE user groups to which new FE user records will be assigned. If this value is not set correctly, the users will not be placed in one of those groups. Please correct the TS setup variable plugin.tx_onetimeaccount_pi1.groupForNewFeUsers in your TS template setup or via FlexForms.
When that is done, please empty the FE cache and reload this page.
The configuration check for this extension can be disabled in the extension manager.