I've set up a Static Web App running on React with Github CI, and it has been working for a few weeks now with continuous updates. Yesterday I bought a domain on Google Domains, and am trying to connect it to my app. To do this I followed this tutorial. On the Google side there were no issues. However, when I try to add the Custom Domain on the Azure Portal, I get this error:

"Could not add custom domain. Please ensure the custom domain is not linked to another app or that a previous implementation is not still being cleaned up."
Now I've waited over 24 hours and am still getting this issue. What could be causing it? I do not and have not had any other Azure apps that use the same domain. Also, now, when I try to access my website through the Azure-default URL, it gives me a 404 error! So I can't even access my site through the normal URL anymore. This is all despite making no coding changes, no build/run issues on Github CI, and the site running without issue locally.