we are collecting data via Enketo webforms (v2.3.6), integrated in ODK Aggregare (v2.0.5). The anonymous access has been disabled, and users received their username and passwords to access the forms.
However, in few cases the username is not collected and the data show "username not found".
Is there any known similar issue? Is it possible that the form is accessed without username even if anonymous access is not allowed?
In my case, I always need to enter credentials, so, I could not reproduce the problem myself. I tried from different browsers and devices. If I switch to full private mode, the form does not work at all (e.g. in Firefox), so that in any case username should be always collected, unless someone has been able to access the form without entering login credentials.