Hi, Level 60 troll mage from Earthfury server here. I can’t enter Zu’Gurrub at all, when I walk into the instance portal, I get an error message “You must be part of a raid group and at least level 50 to enter”. Well I’m above level 50 but not part of a raid group. However, I’ve entered ZG without a raid group before no problem. I restarted my UI several times, disabled add-ons, and reset WoW multiple times. If anyone has any tips or knows how to fix this, please let me know. Thank you!
It works that way in Retail but not in Classic. For a very long time WoW required you to be in a raid group to enter. What we usually did was get a friend to agree to form a raid group so we could go in solo while they farmed whatever they were doing. Keep in mind, the friend who is in the raid group can’t complete quests while in said raid group.
So, not a bug 
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Thanks for the response, I’ll ask someone in my guild to start a party. I thought I entered it before no problem, but I’ll do the raid group!