here is the situation I'm in :
I've been tasked by upper manager "B" to work on a specific project. To help me and manage me more directly I'm supposed to work under manager "A" (B being the manager of A). As A and B are in remote offices, I've starting working by myself on this project, since I needed almost no guidance and everything was clear to me. About every week, manager A was asking me to update him on the project, and I was updating him on my progress (which he was fine with). As of the last time we had a chat, I told him that I had finished everything I intended to do, and that the remaining tasks were things I could not do / decide on my own, and mostly details that needed to be ironed out during a real meeting.
We had another meeting a bit after with manager A and B, the purpose of which was to update B on my progress. What happened was that A told him he was satisfied and what I did was production-ready, now obviously B is asking us to put the project in production.
So I'm in the spot were I'm still missing the technical details / informations / authorisation for completing everything on my own, and my manager A is never able to help me (either too occupied, or give me vague answers, etc), but yet he is assuring his own manager that everything is fine and will soon be shipped. Also there is the issue that it's uncomfortable for me to have no feedback at all on what I did.
(As a example for scale, I've committed something like 5000 lines of codes that my manager is saying are "ready for production" that have never been reviewed )
I feel like there is something bad that is going to happen soon due to deadline closing, and that I will be accountable for it somehow
What to do in this situation?
tldr : what to do when direct manager is not managing anything / not helping, but is assuring is own management that everything is fine?