Fiktionsbescheinigung is the temporary residence permit given to people in waiting to get their residence permit.
I would Like to know if it is possible to open a bank account with a German bank using this?
You can use your passport as ID proof. Your residency status is not relevant for them.
I would Like to know if it is possible to open a bank account with a German bank using this?
Yes, a Fiktionsbescheinigung assumes that a residence permit will be granted.
See Documents needed to open your bank account in the link below: