Hi there, @yoergirl.
You've got me here to share some details about how to get support for QuickBooks Online.
There are various avenues that you can reach out if you need assistance with QuickBooks Online. We have our Online Chat support, which is open Mondays-Fridays 6 AM to 6 PM (PST). We also have our Customer Care Team that you can get in touch on the same business hours.
Also, you have me here in the Community. If you could please provide with some details as to what you were experiencing, I would be happy to take a look and help get it taken care of.
Please let me know if there's anything else I can do to help by dropping a reply below. Thanks for coming and have a good one.