What devices are the users having issues with (model and OS) and what version of the field app are you using?
Note that this error may occur when the survey includes a large .tpk and the device enters screen lock/sleep during the download process. Is this the case your users?
Johnathan Hasthorpe my guys at the fire department are having the same issues. Yet, on my iPhone 7plus iOS 11.3 it works perfectly.
This is the screenshot they sent me... They are utilizing a iPhone X with iOS 11.3
Johnathan for some reason when I try to reply to your comment or the main question the geonet does not offer me the option to upload my xlsx. Any thoughts??
Also, I do not have .tpk associated with this form.
Hmm. I just edited my message to include from "Also" and the option to "Attach" was given below. Hmmm...
Here is the link from online: https://survey123.arcgis.com/share/b5159f8107db4ad0a9d348266e123108?open=menu
Thanks for the .xls - I have not been able to replicate this issue with a recreated survey.
In terms of the link you provided - can you confirm that the survey is still shared, as I can't download it (it says it is unavailable). Once shared I will test on a number of devices we have here.
Also can you confirm whether this was the first time the survey was downloaded by the user or was this a repeat download?
Interesting how you do not have any problems with publishing the form publicly. Yet, I just completely deleted the associated form and folders from our AGOL (City of Pasadena) and the Survey123 website. And the form still has "Unpacking" issues on any mobile device....
Here are the NEW hyperlinks from the Survey123 website:
This is delay in publishing this survey is actually delaying the release of numerous other forms that we (Pasadena Fire) wanted to release to our personnel before the upcoming implementation of our ELA.
It appears you are having the same issue as https://community.esri.com/message/762064-problem-with-public-survey?et=watches.email.thread - when I attempted to open the survey with the same anonymous conditions as in that post, I am getting the same error.