Xfinity app wants me to active already activated modem

Basically what the title says. You guys are forcing me to use the Xfinity app instead of the My Account App, but every time I start it up it asks me to set up my modem, which has been set up for years. Can't even do anything else with the dang app cause of it. I am not going to reactivate something that is activated and risk screwing anything up. I have Uninstaller and reinstalled multiple times. Any help would be appreciated. Thank you.