This morning I had the same Issue as in this thread. I had 7 Updates, but the "Updates" tab was empty. The "solution" seemed to be updating on the "Purchased" tab.
But my tab says, that I haven't purchased any apps yet.
I am logged in….
I moved from Germany to America. But I have downloaded several Updates for Xcode in Germany, as well as in America.
I have changed my "Country and Region" to the States. And I just have tried to change it back. The tab stays empty.
I want to update to Xcode 8.1
Now I'm downloading Xcode as if it would be a complete new app. It asked me to "get" instead of "update" Xcode…
Even tho I have it installed.
I have tried to switch back to the German Store by changing back my "Country and Region". And I have restarted my MacBook 100 times. Also, I only use this one AppID.
First Xcode download was in Germany a year ago. But update to macOS Sierra, what also brought me Xcode 8 was with this Account and with the US App Store… So it should not be a matter of Country/Region…
PS: The updates issue is gone since I have activated Auto Update.. I have no pending updates anymore.
But Xcode is still in Version 8.0 and I'm able to "download" (get) Xcode 8.1 from the store.
Best Answer
The App Store is having problems since yesterday afternoon. It is not your fault, it is a problem on their end. So we just have to wait it out.