It says paycheque sync error, how can I fix this?

If you are facing issues to synchronize with accounts, then,  setup QuickBooks Payroll Direct Deposit help you.

Hello sami-line10tools,

It's great to see that you're working with QuickBooks Online Payroll. I'm here to help make sure you're able to resolve this error that's slowing you down so that you can get back to your pay runs and other business you have to take care of.

Sync errors in QuickBooks Online Payroll can happen for a few reasons, some which you can address on your end and other that occur in the back end system. One of the first things that is helpful to do is to check your account mapping for payroll to ensure that things are lining up as you're wanting them to be. This is easily done in the Payroll Settings through the Gear icon of your account, and you can then click Accounting under the Preferences heading to check on that. This article goes into a bit more detail: Payroll set up: Payroll preferences

If everything is looking as it should there or you've made changes and now need things synced again, the next step to take is to connect with a member of the QuickBooks Online support team so that we can take a look at things from our end. By reaching out via phone, chat, or social media, we can have a private conversation with you to collect the information we'll need to look into this further and find a resolution the sync issue. Please use one of the following options to reach us.

Schedule a Callback or start a Chat: click (?)Help in the upper right in QuickBooks Online > type and enter "Contact support" into the QB Assistant > click Contact Us > explain your situation > click Let's Talk > choose Get a callback or Start a Chat.

Social Media: Facebook, Twitter, and Instagram.
Support hours are from Monday to Friday between 9 a.m. and 8 p.m. ET.

Have a great rest of your day!