hyperlink url not available

I have a text document imported into InDesign in which one imported hyperlink remains red in the hyperlink panel, indicates "URL not available," and will not open the link. There are several other imported links that work properly. 

I can open Edit Hyperlink in the Hyperlink Panel and copy the link, paste it into my web browser, and it will open the link. I can also insert the link into a Word document and it will work. I have tried deleting the link from the Hperlink Panel and recreating it, both by typing it in and by copying and pasting the address from the web browser, when it opens the link. I have even tried inserting the link as the sole content of a Word document, then placing that word document into InDesign; that still only produces the "URL not available" message.

From the other similar posts, my guess is that this is some sort of firewall or login requirement by the website I am trying to link to, but I am curious as to why only InDesign seems to encounter it? And I would greatly appreciate it if anyone can suggest a work-around?

This is occurring on:

27 inch iMac, 2019

Big Sur 11.5.2

InDesign 16.4

The file originally placed is a text file from a web archive of an online posting of the document. Several other links included in that text file do import and work correctly.

As said above, the problem also occurs when the link is created in a Word document and then placed into InDesign.