Protected Area Permit For Arunachal Pradesh - How to apply?

Hello, I'm wondering if anyone has knowledge about applications for permission up travel to Arunachal Pradesh as a foreigner. It seems there was until recently a physical office where you could apply for the permit in Guwahati, but it is closed. The online portal from the government only allows groups of two or more to apply (the office in Guwahati did not have this stipulation). None of the relevant phone numbers on the Arunachal Pradesh tourism website seem to be valid anymore. I am trying to travel solo to Tawang very soon and any advice or recommendations on who to contact are appreciated.