Oath failing on applications that previously worked

Hi all, ive been coding a few apps recently to test what sort of use i can make of the api data and oath has previously worked for all of them. Now, when i go to initiate oath i get 

“

{"message":"Bad Request","errors":[{"resource":"Application","field":"client_id","code":"invalid"}]}

”

when i know for certain that my .env file hasnt changed and even in new apps i have definitely copied it correctly. Any suggestions on next steps? Client id: “232161”

thanks.