Portal: Survey123 data can't be edit unless your the form owner even though your a member of the group.
In Enterprise 10.7.1 we experience a rather inconvenient issue in survey123 data edit wherein a member of the group were the form is shared is unable to edit the form data.
We confirmed that only the form owner and organization administrator has the ability to edit it. In AGOL as long as your a member of the group were the form is shared it should allow you to edit it.
ESRI support case Esri Case #02574731 - unable to edit survey123 confirmed that this is expected behavior and currently not supported in the product.