Which SDK are you referring to? Adobe has several SDKs because Adobe has a lot of products.

It is unusual that your web pages stopped loading while the browser was trying to load a script asynchronously. Could it be that while your Launch snippet was async, but there was custom code in it that was synchronous?

You can ask one of your Analytics product admins to go to https://developer.adobe.com/console and find it in the list of projects there. And remember to document this for the next person who asks for this information.

In your Analytics extension in Tags, what is the version of AppMeasurement used with it? I think the s.join plugin got merged into the AppMeasurement library with some version, that's why it's not available as a separate plugin now. I think Adobe has also deprecated the s.crossVisitParticipation plu...

Regarding the s.join error, what plugins are you using in your AA doPlugins section?

Instead of using custom code, try the Core extension's "Enters Viewport" event to see if that works for you.

And for a comprehensive tutorial to setup Web SDK with Tags, start here: https://experienceleague.adobe.com/docs/platform-learn/implement-web-sdk/overview.html?lang=en

Err, no. ... Well, ok, yes, you could, but it's not normally done. A data element normally contains the value that you want to pass to the eVar. It's not meant to work the other way around. Can you describe your situation to explain why you want to set a data element with an eVar's value?

@TLFish you're right, ideally, it should. As long as it's near the "top" of the page, then it should still work well, since it would be one of the first things that the browser executes before the rest of the page content. BUT the order must remain: Declare adobeDataLayer, optionally with some initi...

AA itself has several ways to identify a unique visitor. These are documented at https://experienceleague.adobe.com/docs/analytics/components/metrics/unique-visitors.html?lang=en#how-this-metric-is-calculated . In your case, since the ECID isn't available opted-out users and you're not setting your ...