Thanks for the update.
On Monday I will chat with the Samsung support-people. I am pretty sure (as sure I can be without access to source code) this is caused by erroneous design. Let's see if they have a decent work around. I will keep you posted.
I am using 3 channels to drive the TV: 1) terrestial digital tv, 2) Smart hub-built-in thru wifi, 3) Chromecast thru wifi.
If my wifi had not preferred to use 2) to watch Viaplay I would have had a very easy & good work-around.
BR Björn (who is M.Sc CSE & IEEE Sr member)
Upate after my chat w/ the Samsung support-people.
Short-version: what a waste of time. I believe the built-in Smart-hub is a dying feature.
Long(er) version: They recommended "reset of Smart Hub". Did not help but I have the opportunity to enter credentials again. Fun. Not.
Bottom-line: I will convince my wife to use her Android phone to drive Chromecast to drive the Samsung TV. On Android 9 the Chromecast & the apps work like a charm.
Mine has been doing the same thing for 3 weeks now. I just tried the advice from someone in this thread and it worked!! Go into smart hub, click on an app that you have never used. It will say that app needs updated, it updates automatically and away you go! Yay!!