so if I understand this correctly. You got an website on that website there is a page that has an Iframe embedded into it. the embedded I frame can be multiple things. (sheets, single objects etc.) for now I assume that you embedded a single sheet into an Iframe. if this is not the case. the following still stands.
when User A presses the the Reload button in the Iframe it takes a couple of seconds (or longer) and after that data for UserA and UserB are refreshed.
you are already saying it yourself where the issue might arise.
I understand that the issue arises from them using the same application, but it is a requirement for me to use the same data source. Is there any way to prevent this situation from happening?
when an app is refreshed the data in this app is also refreshed. Because User A and User B are looking at the same app/sheet the data is going to be the same. so when the refresh is done (triggered by User A) all users see the same data.
how can this be prevented.
there is only 1 way to prevent this. you need to copy this app and give UserA and UserB there own copy.
2 sidenotes to this.
1. on the website part you need to make sure that the specific user will be send to there app.
this can be done by security rules and appID's.
2. I think that for 2-10 users this will be manageable but 100+ will be a nightmare if you need to update stuff.
therefore a good system needs to be in place (preferably automated) that if the main app is updated with new code/object all the user apps will be too. this can be done by automations (if you are on Qlik Cloud) or via a python script if you use Qlik Sense enterprise for windows.
