What is the problem with Safari not allowing access to Edward Jones login access?

The real culprit is almost always Safari’s (or other browsers) stored data or settings. Financial websites tend to be very picky about cookies, cache, and cross-site tracking settings, so if Safari has stale login data or overly strict privacy options, you’ll hit login failures. Since you can log in fine on your MacBook Pro, the difference isn’t the OS—it’s how Safari is configured or what’s stored on the iMac. Clearing cookies for edwardjones.com, emptying caches, or temporarily adjusting privacy settings usually fixes it.

Updated to latest Safari version, cleared all the cookies and cache etc. even called Edward Jones. EJ apparently did a security update and has been working with Apple for the last week or so to correct this problem. They told me to use Google Chrome which will not happen. So I can still access my account via my I phone but not my Mac or iPad.

I agree on not using Google Chrome. However, I do suggest that you try the Brave browser to see if this will allow you to access this site until this get resolved.