Yes you can add a support contact, as described here:
docs.microsoft.com/.../technical-support
To supply your support contact information in the administration center
In the Business Central administration center, choose the environment that you want to specify your contact details for, such as Production, and then, in the Support menu, choose Manage Support Contact.
Fill in the Name, Email address, and the Website fields, so that your users know how to contact you for technical support.
Optionally, choose the Apply to all environments checkbox if you want to add the same details to all related environments for this tenant.
Your customer can now contact you if they experience problems that they cannot resolve themselves. If you also cannot resolve a reported issue, you can escalate the issue to Microsoft.
