If Baha'u'llah has fulfilled all the prophecies for the return of Christ then you are actually saying that the Bible is wrong since the Bible has prophecies that Baha'u'llah has not fulfilled.
Baha'u'llah has fulfilled all the prophecies for the return of Christ, since He was the return of Christ.
The prophecies for the messianic age have not all been fulfilled yet since we are only 172 years into that age, which will last no less that 1000 years.
More of those prophecies will be fulfilled as time goes on.
Point to a prophecy that has been fulfilled by Baha'u'llah.
Micah 7:12 “In that day also he shall come even to thee from Assyria, and from the fortified cities, and from the fortress even to the river, and from sea to sea, and from mountain to mountain.”
He shall come from Assyria: At that time Assyria was a large area. Baha’u’llah and His family lived in the part that was Persia, now Iran, in the city of Tihran.
and from the fortified cities: Baha’u’llah was banished from city to city: After being released from the Black Pit dungeon in Tihran in 1852, His family and companions had only a short time before being sent to the fortified city of Baghdad. While living in Baghdad, He gained such a large following that the enemies where shocked. Right away He was banished again, this time to the fortified city of Istanbul.
The Governor of the city refused many times to fulfill the orders that he received to banish Him again. Finally forced to follow orders, Baha’u’llah was banished again to the fortified city of Adrianople. He was honored and praised, and shown respect everywhere, until He was finally sent to the most horrific of all places, the fortress of Akka, where it was expected that He would succumb to the terrible conditions.
and from the fortress even to the river: It was while in Baghdad that the Tigris river became a special place, as Baha’u’llah crossed it to the Ridvan Garden. April 21, 1863 was the fulfilment of prophecy, as that was when Baha’u’llah declared to those around Him His Station as the Manifestation of God.
and from sea to sea: After His banishment in Baghdad, His exile was by way of the Black Sea. Still a prisoner He crossed the Black Sea from Sinope on His way to Constantinople. After the banishment in Adrianople, He crossed the Mediterranean Sea from Gallipolis in Turkey, embarking at Alexandria, Egypt, then on to the fortress of 'Akka, the most desolate of cities.
and from mountain to mountain: The time in Baghdad was turbulent with opposition. To protect His family and companions Baha’u’llah went to the Kurdistan mountains. There He lived in poverty, but the area was magnetized by His presence. After two years, He was persuaded to return to Baghdad.
The other mountain was in Israel, Mount Carmel, where He had docked before His final journey to Akka. Later He had a chance to return to Mount Carmel, to pitch His tent. Here He wrote the Tablet Of Carmel, surrounded by pilgrims looking for the return of Christ to descend from heaven. Mount Carmel is the headquarters of the Baha’i Faith. What we see there now is the fulfillment of the following prophecies:
Isaiah 35:1-2 “The wilderness and the solitary place shall be glad for them; and the desert shall rejoice, and blossom as the rose. It shall blossom abundantly, and rejoice even with joy and singing: the glory of Lebanon shall be given unto it, the excellency of Carmel and Sharon, they shall see the glory of the LORD, and the excellency of our God.”