You might need to share the Business ID of your Facebook Business Manager. In this way, an access request can be sent directly from another business to yours.
It is quite easy to find your Business ID on Facebook Business Manager. Just log in to FB Business Manager and then you will see your Business ID on the URL just like in the below screenshot.
The FB Business Manager Business ID is not confidential information. You can share it with the parties that you want to work with.
You can also check the following help center content if you want to share FB Business Manager access with the Analyzify team: Provide Access for Your Facebook Pixel