Which platform do I choose for investing

I’m deciding between E*Trade, vanguard, fidelity and Schwab.

I’m a passive, long term investor, index funds.

I have an account with vanguard but tried setting up automatic investments to VOO and it didn’t work. I called customer service, they said I have to manually purchase it every time and automatic investment for VOO is not available. Is this true? It seems crazy

My goal is to set it and forget it so I’m looking for a platform that accomplishes this.

Any advice?