I've been getting this message on my Samsung 9 for several weeks. I didn't notice it corresponding to an update, etc. Depending on what it appears in front of on the screen, I sometimes have to wait for it to disappear to move forward with whatever I'm doing.
Do some research. Nobody has installed a Covid tracker. What both Samsung and Apple have done is provide an API for app development in regards to contact tracing. This is great for 3rd party developers and even governments.
But 5G controlling your brain is real. 🤣
S9+ on AT&T. "Can't install app. App not optimized for use with secure folder" has been annoyingly constant for the last 3 weeks! I'm ready to toss this phone! Help, Samsung!