Dear @Malcolm,
Welcome back to the Wefugees Community and thank you for reaching out to us again.
Yes, you can travel with a "Fiktionsbescheinigung" according to section 81 (4). We discussed this question here before where my colleague provided some further information.
Important: Travelling abroad is not possible with the Fiktionsbescheinigung according to section 81 (3)!
I hope this helps and please don't hesitate to get back to us with any further question.
All the best,
Meike