a tech had me install an app called techsee instant mirroring so they could observe me complete a speedtest. Is this normal? I just want to make sure I didnt install a malicious app?
Did you have an issue with you internet speeds? Did someone call you? There is no need to install a mirroring app to run a speedtest. The common website for speed testing is speedtest.net you can share a URL to the results. I would Delete this app ASAP.
If it's the legit TechSee app from the Apple App store or the Google Play store then it should be safe.