I am new to ZHR Master Weekender - did my first race on Sunday. Today I have been DQ. Any idea why?
Yes, I used the ZHR (G) after my name...

?????
ZwiftPower did not record you as having the appropriate tag to your name; did you change it before you entered the event or only once you joined the starting pens?

If you can provide a screenshot or link to a video of you racing with the ZHR(G) tag visible on screen, I can reinstate you. The tag is necessary so that others know against whom they are racing in their age group