What I did to fix this issue was:
- Remove the contents in folder ...\VisualStudio under this path:
C:\Users<USERNAME>\AppData\Local\Microsoft\VSCommon\OnlineLicensing\VisualStudio\
Note: you can backup the contents of this folder for safety if you'd like. - Re-Start Visual Studio
- You should be promtped to re-enter credentials if any
hope this helps!