Okay an update. After a reboot of my PC seems it is blocked again. I found a way to permanently fix the issue and tested it after a reboot.
You will need to access gpedit.msc and those with home versions of Win10 (most of us) will need to enable the disable gpedit.msc
One suggested method and you are welcome to google other methods is below:
Enabling GPEDIT microsoft console on Win 10 home edition
Run the gpedit.msc command and then follow these intructions:
Instructions to modify Teredo through group policy
Also from what I have read you must hae the win 10 firewall on in order for Teredo to properly work.
See Microsot’s other requirements here