I received my bachelor's and master's degrees from university A. I was then supposed to do a PhD at university B in a different country but relocating did not work out (I did not start in the program). Some time later, I took a temporary research assistant position at university C. I was hoping to do a PhD also there but having considered the topic/group I think it is not a good fit for me.
I have discussed about returning to A but not signed a contract yet. Would it be disadvantageous to get all degrees from the same university?
I had very high expectation for the PhD since I was a very good student at A. However, I have now had two attempts going elsewhere and neither succeed. I am not sure how much support I would get for further applications.
Should I stay at A and try again after the PhD? The thing is, A is not very well-known university.