New org asking to work in a different role

Joined a new org 9-10 days ago where I had been interviewed for a developer role in a legacy tech stack. Yesterday in a connect the TL told me I won't be working on the development side of things but rather in the environment/platform side of things, mostly doing configurations with minimal or no coding. The role seems very specific to this org and considering this is on a legacy stack I don't think there's much scope even in learning for me at all. I had two stages of interviews with this org and all of them were for a developer role, something like this did not even come up during interviews or the pre-connects I had with them pre joining. So confused and frustrated, because I had accepted this offer since it's a PBC and moved to North India even when I had a 22% higher offer in a tier 2 based service company in my home town. I have two options now:

1. My team has a great WLB. Stick to the non dev role & use the next 6 months to practice DSA & upskill myself from my current legacy stack to something more commonly used like Java/Node and crack some other PBC.

2. Immediately start looking outside and interviewing again for a developer role in my current legacy stack, since I am on probation and can leave early and maybe even get a small hike over current CTC.

YOE - 2

Can anyone please give some inputs or suggestions on what to do? Been interviewing since March and I finally managed to clear one and now this shit is happening.