Quick update. I installed Google Chrome and after enabling Flash the page I was trying worked. In Brave browser and Firefox, enabling still does not work. It makes me think maybe there is another security/privacy setting that is on by default in Firefox and/or Brave that Chrome does not have on by default which also affects Flash.

Type about:addons<enter> in the address bar to open the Add-ons Manager. Hot key; <Control> (Mac=<Command>) <Shift> A)

On the left side of the page, select Plugins. Make sure the ones you want to use are set to Ask or Allow. ++++++++++++++++++++++++++++++++++++++++ Go to the web page. Once the page is loading, mouse to the address bar and Left-click the icon. Select Permissions. In the menu, Make sure the ones you want to use are set to Ask or Allow.

> In my plugin settings, Flash is set to ask to activate

I already specified that Flash was set to ask to activate in my original post. I also don't see anything under permissions for the site where I can set Flash to be allowed. When I click the icon, then select permissions, the only options are Location, Camera, Microphone, Notifications, and Autoplay.

Are there frames used on pages where you do not see the Lego block icon on the location bar ?

If content is loaded in an iframe then you may not get a request to activate Flash.

Yes, in particular this happens for a spend tracking tool on one of my credit card accounts, otherwise I would just point you right to it, but this does seem to happen frequently to me with Firefox on linux. It was the same with Ubuntu as I remember, and I haven't gotten Brave browser to be able to work either, but I have gotten chrome to work. It makes me think that it has something to do with a security setting.

I do keep the privacy and security settings fairly tight typically, but nothing that I need to make tweaks in about:config for, just what can be handled from the preferences menu. Also I have content blocking set back to standard right now and that doesn't seem to be working either.

I'm also using ublock origin, privacy badger, https everywhere, and decentraleyes in terms of privacy and security addons, but I've tried disabling all of them at once and reloading and it still doesn't work.

Is there a log file I can find or print out to see what may be happening?

I did try looking at the source html for the page this happens on, and searching through for the string "iframe" and came up with nothing, but I'm not a web developer and I only ever learned a small bit of html over 10 years ago, so I'm not totally sure what I'm doing and if I'm searching in the right place. I'll see if I can find another page where I can reproduce this which anyone can access.

https://www.whatismybrowser.com/detect/is-flash-installed

That page doesn't show me a plugin block to click to allow anywhere. This image I included is a screenshot of that page, including the URL bar which doesn't show the plugin icon. They do recognize that I have javascript enabled though from this link.

https://www.whatismybrowser.com/detect/is-javascript-enabled

That website uses navigator.plugins["Shockwave Flash"]; to detect the Shockwave Flash plugin and doesn't create a Flash object, so you won't see the Lego block icon on the Navigation Toolbar.