Endpoint order-received missing

Hello, my site is https://vegansupermarket.com.ua and in time of moving site to a new domain i’ve lost an order-received endpoint crash and on pushing on pay order button i see only this page and no order-received page and no emails with notification is sending.

I’ve already check my permalinks and try to off all plugins. Endpoint is still not working.

I would be so appreciate to get a solution.

Vegano Hooligano Ukraine