SP2016 Forms - Allow Anonymous Access

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check CA to ensure it is allowed http://CA:1234/_admin/NintexForms/LiveSettings.aspx?source=/_admin/Nintex/Management.aspx

Domains are only required if you authenticating.

Thanks - you mean this, right?

Can it take a while to cascade across to update the form settings, if this is the case? We did just update this today.

It will probably need to wait for an app recycle or an IISreset potentially.

I think that was the key, the IIS reset -- the "Allow Anonymous Access" is now checkable (WOO!) ....however... now I'm getting this lovely issue: 

1) Form is published (republished it twice to ensure)
2) There is no expiry date on the form. 

Still happening?

It seems to have corrected itself in the mean time, but I know that it took 2 days ++ from the initial posting (and IIS reset). Other things may have happened that I am unaware of. We found a way around it (using another form), and ended up ignoring this problem.