Seems to be OS version independent, as it behaves the same on multiple ( UpToDate ) systems ( Windows 11, Windows 10, macOS 14.0, ... ).
It also seems to be network and hardware independent ^^'
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Its weird that Enpass doesnt recognize the username Input Field, because it even contains the autocomplete="username" tag easily identifying it as such:
<input type="text" name="<randomstring>" id="<randomstring>" value="" class="nbf-text-input" maxlength="16" autocomplete="username" placeholder=" ">
Maybe the absence of the password field on the page prevents the autofill from working?
As soon as you input the right username the page will partially reload itself and display the password input type="password":
<input type="password" name="<randomstring>" id="<randomstring>" value="" autocomplete="off" class="has-inline-icon nbf-text-input format-password-show" maxlength="38" placeholder=" ">
As soon as that happens Enpass instantly shows its Popup underneath the input field.
Ironically Enpass ignores the autocomplete="off" property completely XD