Always Getting Invalid API Key Error

I just installed this plugin last week on my WordPress install (still running 5.7.2 but it’s stable and works fine). The plugin works fine, no problems, but after a few hours the API Key seems to stop working. For the first few hours after activating the plugin, it shows submitted URLs as successful.” But after about 6-8 hours later, everything changes and then every URL submitted says “Failed – Invalid API Key.” I have to de-activate and activate the plugin againf rom scratch for this to fix itself. If I leave it, it stays this way and then every URL submitted has the “Invalid API Key” error.

Why is this happening? It works fine at first and some URLs DO submit successfully, but then it all changes and I can’t figure out why. There’s no other settings or options or anything else to look at with the plugin. When it’s active, I can’t find any meta in the header of my site showing or listing the API Key. I know I an get API Keys myself from the Bing website, but I can’t add them or change them within the app. What’s going on? Why does this error keep happening day after day after day no matter how many times I re-activate the plugin??