"Account assignment failed due to an unknown error" on many things

I have been using teamviewer in Corprate and Private situations for years and this is the first time i have hit a major stumbling block, and everything I have tried has failed.

* Corporate License

* Windows 10

* 4th Computer added

* Added other sucesfuly after this one

This is my main day to day PC that I use to access the others - so incredibly frustrating.

Tried:

* uninstalling - cleaning out registry, reinstalled - same error

* uninstalling - cleaning out registry, build customer MSI - reinstalled - same error

Any ideas welcome ( but Ihave probably tried them already) ..

Cheers

Morgyn