Bot Add in installation failing due to subscription

Did you follow the instructions in this Walkthrough dev guide? If you did, can you share a few lines of code of your app so I can help.

Yes (although we did not opt to use the js bot framework we wrote our own api wrapper in c#), we already have a bot add-in promoted to production that is currently functioning. My oauth redirect url is responding with 200 within the allotted time and everything on my end seems to be behaving as expected as far as I can tell.

I was hoping to just confirm whether this is an isolated issue or not.

If this is not an isolated issue, I did notice that there were some changes made to enforcement of expiresIn arg for createSubscription mentioned in another post around the same time I started encountering this issue.