Thanks for your feedback. We would like to get more information on this.
1. Teams only has a desktop client. When you mention web installer, are you talking about the .exe file you download from teams.microsoft.com/download? Or are you talking about loading teams.microsoft.com on the browser?
2. You had mentioned SfB in your description. Are you experiencing this issue with SfB or Teams or both?
Please let us know so that we can solve this issue for you.