There are two main reasons for your IT administrator has limited access on Windows 10.
Group policies
Group policies could be another reason for this error.
You should jump in to the administrative account if you have multiple accounts created on your system.

Thus, you should uninstall your antivirus before turning on Windows Defender.
you might use the account to turn on Windows Defender.
Step 3:Then you’re able to log into it on the Login screen.
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Step 4:Then you should sign off of your account, and log into the hidden administrator account.
If it still exists, you’re able to move down to the last method.
Method 4: Edit Group Policies
This method is to edit the Group Policies.

Heres how to do it:
Step 2:ClickAdministrative Templatesand then double-clickWindows Componentsto expand the list.
Step 3:Navigate toWindows Defender, double-clickTurn off Windows Defenderand clickAllow antimalware service to startup with normal priority.
Step 4:SelectDisabled, clickApplyand then clickOK.
Step 5:Then youll findClient Interfaceon the same list at the top and open it.
Step 6:Finally double-clickEnable headless UI modeand clickDisabled,ApplyandOK.
Final Words
Here is all the information on how to Fix IT administrator has limited access error.
If you meet such an error, you might try the methods mentioned above.
Your issue can be fixed by one of them.