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@bjornbjorn Got Simple Registration and trying to use it for a front end member registration form, but getting the following error when trying to register via the form:
The form you submitted contained the following errors
group_id: You must select a valid group.
I'm using EE 3.5.10 - the member settings should allow member registrations, and it's set to require admin moderation:
The "pending" group does exist.
Please help!
This response is probably too late for you, but I've just had the same issue with the built-in EE member registration.
The solution seems to be, under Control Panel > Members > Member Groups, to unlock the groups that you are allowing members to join. Click on the member group name and click on the Security Lock switch.
You need to add the group_id to the form as a select field, with the option value being the id for example...
<select name="group_id" id="">
<option value="1">Bookings</option>
<option value="2">Members</option>
<option value="3">Admin</option>
</select>
Then it will work.