Please ensure your rules are in their own file, and run:
modprobe tun
And see whether the permissions are correct.
If not, attach the output of "udevtest /devices/virtual/misc/tun"
** Changed in: udev (Ubuntu)
Status: New => Incomplete
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Cannot change /dev/net/tun file permissions with udev
https://bugs.launchpad.net/bugs/265138
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