Hundreds of asylum seekers flock to a Lower Manhattan federal building in the pre-dawn hours each day in a desperate bid to get benefits, services and keep court appointments — as confusion continues to reign during the Big Apple migrant crisis.

The massive queue, nearly entirely made of migrants bused to the five boroughs from the US border, forms outside the Jacob K. Javits Federal Building every morning.

Those who join are seeking everything from asylum to work permits — with scores of them pitching up and spending the night on the sidewalk and using the nearby bushes as a toilet.

Many told The Post Thursday they were told to come back another day — while others were simply turned away.

“I have a court appointment,” said one Ecuadorean migrant who waited in line with her two children. “They turned me back because my husband [is] not here. They say he has to be with us. Right now the man said he can’t put the three of us through. We have to be the full four.”

Ousmane Coulibaly, a 34-year-old Senegalese migrant, waited by the courthouse from 10 p.m. Wednesday to apply for a work permit — something not yet available to her.

“I sleep on the ground,” he said Thursday morning. “I see two people and we go and grab some boxes and we sleep here. I say, ‘Let me come and see if they can help me to get a work permit. I want to work and take care of myself.'”

Coulibaly is due in court next February but was so desperate for help he showed up Thursday.

At least 300 stood outside the federal building by 7 a.m., most of them migrants whose journeys began in Ecuador, Nicaragua, Honduras or Venezuela, or as far off as Russia, Nepal, Pakistan and India.

Everyone waits in one huge line, but once at the front people are filtered in different directions by staff depending on where they need to go — or turned away entirely if their papers are not in order or they have come on the wrong date.

Among the throng were migrants who arrived from the border to the Big Apple and are required to register with Immimgration and Customs Enforcement [ICE] within 60 days.

Others were appearing for check-in dates as part of their asylum applications, or sought to apply for work permits.

The government building houses multiple federal agencies, including Immigration and Customs Enforcement, the Department of Homeland Security and US Citizenship and Immigration Services as well as immigration courts.

Aside from migrants, anyone pursuing immigration realted matters, such as US citizenship also has to make an appointment at the same building.

“I’m here because I have an appointment for asylum,” said Mann Singh, a 37-year-old Indian migrant who waited in line since 2 a.m. on Thursday with his daughter, Jasmeen Kaur, 11.

“We got to the fifth floor and give them the papers,” Singh said. “They took our papers and checked them and give them back. They said they are going to call us. They didn’t give us a date.”

Rufat, 46, a Russian migrant who fled the war with Ukraine last year, said he has been staying at a Brooklyn facility since, and continues to hope for both a work permit and asylum.

“I’m here for the work permit,” he said Thursday. “I have not been working and I want to work. After the work permit I hope to get asylum. Last year I passed the border. I sat there for a month in detention.”

The line of hundreds of people is longer than can be served in any one day and although there are a small number of spaces for those without scheduled appointments, these are quickly taken meaning many disappointed people are turned away and have to re-join the next day.

More than 113,000 migrants from the US border with Mexico have poured into New York City since the spring of last year, with nearly 60,000 now in city or state-funded shelters in the five boroughs.

On Wednesday, Gov. Kathy Hochul ripped the White House for failing to fast-track work permits for the migrants, with Mayor Eric Adams also pleading for help from President Joe Biden, and warning of what springs up in its place.

“We created a black market of employment, low wages, women have been sexually exploited. Workers have been treated unfairly,” Adams told CBS News this week.

“So you see an increase in prostitution in the city because people have to provide for their families, and it is really going to impact the quality of life in our city.”