CPA is refusing to include solo 401k in the tax return

[Arshad Hussain]

My CPA says solo 401k is not allowed in my condition while several providers say it is allowed , who should I listen to. I want to use solo 401k so how can i convince my CPA. He says this link not applies:

https://www.irs.gov/retirement-plans/one-participa...

Me and my wife are part of solo 401 k trust and we both have regular w2 incomes but several side gigs. Please help.

thanks