Why would you mention trying something that I already said was tried in the original post?
"When trying to add a public folder, I either right click the Inbox folder or click the triple dots (ellipses) button and then click on "Add public folder to Favorites" and nothing happens. No window appears. No other menu appears. It just does nothing."
I already gave this information. Did you just not bother to read it?
You also asked "What is your Outlook client version?". Why on Earth would you ask this question when this problem does not pertain to the Outlook desktop application? You seem to just have responses in a template and you copy/paste them. You did not address my issue at all.
Also, there is a known issue for this that Microsoft is currently addressing and has acknowledged. Part of your job is knowing this and informing customers of this information.