I might be wrong about being able to do this for your main number fax, but for fax numbers associated to users this should guide you: https://support.ringcentral.com/article/9758.html
I would chat with support about how to do this for the main fax. They may need to move it to a user to allow you to do an unconditional call forward on it.
Good luck.
Have you heard any updates to making the main fax number forwardable? Our current work-around is to have fax attachments sent to a group email, then download and forward to our EHR system... not ideal, but manageable.
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