Alright, after some thought and testing, I found the source of the issue, which might be helpful for others. In the registration form, one of our custom user fields was neither set as optional nor mandatory. By default, it was likely treated as mandatory. However, when users didn’t fill it out, there was no clear indication that the field was required. Perhaps adding a visual cue, like a red dot or a message next to the field, could have clarified its mandatory status. Without this, the form simply wouldn’t validate.
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