I was attempting to make a copy of my Web Map by using "Save As" to create a second version. It gave me a 504 error when I tried. I get the same error now every time I attempt to save changes in the map:
Unable to add layer NWIL Asset Map
This map was working fine the first week with all the layers I currently have on it. It only stopped allowing me to make updates after I attempted to use the "Save As" function earlier this week.
I have tried both Google Chrome and Edge browsers, and I had my co-worker on his computer try to save it, as well. The same error occurs each time. Here is the map for anyone who would like to try, themselves:
Edit: Playing around with it a bit more, the issue is with the Municipalities and Counties layers. If I delete those layers, I can save and copy the map as much as I want. I can then add those layers back and save just fine, but after I save a few more times or if I try to do a "Save As," I get the error again. So I delete them, re-add, and the cycle happens over again. I'm not sure what is wrong with just those layers.