Odoo Accounting Configuration for Canadian Client

I own a Canadian bookkeeping firm and we recently got a new client who's using Odoo. The client was not using the full functionality of Odoo, in particular they were not using the tax return feature. We're having problems setting this up, so I'm  seeking an experienced professional to help resolve this. The ideal candidate will have extensive experience with Odoo setup and the accounting module.
As I can't grant access to the clients Odoo account, this work would have to occur over video calls with myself. Longer term, we're considering trying to build up the number of Odoo clients we service, so it would be great to have an expert in my network that I can call on for advice.

• Resolve the tax return setup issues so that we can use this feature