Same for me.

is it ur first time purchases any game or top up ur steam wallet?. Because if it is, u need to wait for 7 days until it available

I had this. It would look like it would confirm on phone, but then nothing. For me the fix was on the phone, to update steam and also to update android (I had been delaying running the latest update). Restarted phone after doing both. Then now when I confirmed on the phone it actually confirmed.