I recall something about security changes for 2020 and 2019 and I believe that you now need to have the new MS Chromium Browser installed.  This is generally available in the latest Windows 10 20H2 feature pack, though it may also have been installed with the V2004 update .  It can be installed standalone.

Feature updates are not always automatically installed and can be deferred, but you should get up to the latest before the Tax Season.  The V2004 update can take 1-2 hours.  Do it hardwired.  The 20H2 is only a few minutes, but if you are still on V 1909 then it will do both in one go (ie 2 hrs) so plan accordingly. Plan on not working during the upgrade.

Current Version: Settings=> System => About

To Update: Settings => Updates and Security => Windows 10 20H2 Feature Update.

To install only the new Edge Chromium browser go Here

Also see this posted earlier I believe.  The minimum browser recommendation is WRONG.