Website will not let me update stock inventory

[LeeAnne2021]

No matter what I add to my Items it says this when I click the inventory stock box (where you add how many you have of each item)-This sku is currently unavailable at any of your locations. To change this, edit it in Square. When you hit the Edit in Square option it says Sorry, the page you are looking for could not be found.
I have refreshed, closed out, saved the item & then gone back in...nothing. It's crazy frustrating! What do I do!?

[Joe]

Hi there, @LeeAnne2021 👋 Welcome here to the Seller Community! So sorry to hear about this trouble you are experiencing with your inventory stock. Strange, indeed.

Usually these type of loading error messages can be pointed back to an outstanding software update available for either your browser or your device itself. 

Would you mind walking through these troubleshooting steps? They will insure both your browser, as well as your device itself, are both up to date.

Keep us updated on your progress!