Can we upload all of them with one firefox account?

I have a question. We created Firefox AddOn for our clients that is one application.
But this application, self distribution apps, is customized for each other clients, changing config file of javascript and gecko_id of manifest.json.
So can we upload all of them with one firefox account?

We created each other firefox accounts, for example staging.[guid]@techtouch.jp, and upload to sign customized addOn to the developer addOn agreement.
Then we receive below message.

The email address used for your account is not allowed for add-on submission

Maybe blocked accounts as spam email.

https://extensionworkshop.com/documentation/publish/developer-accounts/