Let me share with you some learning about filling CIS inside QuickBooks Online.
An early CIS return may get rejected when submitting it in QuickBooks Online. I'd suggest filling it directly to the HMRC. Before doing that, let's check first your information by going to the Account and Settings to avoid rejection.
In the Settings page, choose the Advanced tab.
Select the Construction Industry Scheme (CIS) option.
Verify your UTR no., Employer’s PAYEreference no., and Accounts office reference no.