I am having a red banner show up saying the zipcode is invalid .. after making a new listing to sell..?.. not sure how to fix it..
Are you trying to do this via browser or app? It makes a difference in trying to help you. There are several other threads about this, for example https://community.etsy.com/t5/Technical-Issues/Invalid-zip-code/m-p/139211499
If you are getting this error on a browser, it wants a 5 digit zip code.