I have a problem.. 
Every time I try to log into the web player I'm greeted with 

So you've discovered the tab limit...
You've got too many tabs open. Close this one and continue listening.

However I don't have any other tabs open anywhere. 

Running on Windows 10 
Troubleshooting performed:

• Attempted on Chrome **bleep** 
  • Attempted in Incognito
• Attempted on Edge 16 
• Attempted on Friefox 62 
  • Attempted in Private mode 
• Used the "Sign out everywhere" feature in account data
• Cleared all browser data in each browser from the beginning of time 
• Restarted the Browsers 
• Restarted the computer 

I don't know what else to try on my end, but this is a real problem. False positive on connected devices.