I am a returning teacher currently in Phnom Penh

Hello. Similar to Peter from Australia, I am currently in Phnom Penh and I am waiting to return to China. In my case, I will return to Beijing and I have the necessary documents for my specific situation. Those documents include an invitation letter from the Municipality of Beijing, a copy of my work permit, my expired Residence Permit (expired at the end of July), and a copy of my current work contract. I would also need to get the documents authenticated at the embassy in Phnom Penh in order to receive a visa. Should I make an appointment at the same email address?