Unable to sign in to Dropbox in MacBook Air Taskbar

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Application Affected
Dropbox App
Device
MacBook Air
Operating System/Browser (if using the web)
MacOS Tahoe 26.3
Dropbox App Version (if using the app)
144.4.4491

Question or Issue
Problem best stated as OS based App will not open on MacBook Air, and will not let me login.  

Background:  It’s been awhile since I actively used Dropbox; it has probably not been backing up as intended.  I realized a while ago that I had two accounts, and am finally going through the process of combining data by sharing from secondary account to the primary, so I can delete one account due to renew 3.30.26.  I’ve been working on the Browser-based Dropbox to do this.  My problem is that now I am trying to see all the shared folders & files on my MacBook Air, and to verify that these are all “available offline” before I continue the process of moving, backup and deleting redundant account.   But I can’t yet see then newly shared folders in Finder on MBAir, although I see them in the primary account in Browser-based view.  I opened Dropbox in the Taskbar but any attempt to use it sends it into an endless loop.  

I chose to make the primary account - the one I will keep - that same user name / email as my Apple account, at least I think that is what I have done.  I’m not sure if that is the issue, though.  When I open the Dropbox in Taskbar, I can see the general, account, backups, network, notifications, and sync tab.  Selecting Account shows me message to Sign in to a Dropbox account, but doesn’t ever finish spiraling.  

My account is Dropbox Plus.

What do I need to do to fix this?