Hey! So, since the above method did not work, we will try another way to get the evolution prompt to appear for your Togepi. Please try the following steps:
Let the Togepi die in a wild battle not trainer battle
Logout
Close the game client completely
Login
Heal the Togepi in a Pokémon Center and then make it full happiness
I apologize for all the trouble. I hope the above solution works out for you. In the event that you still do not get the evolution prompt, I will look into this more for you. Regardless of the outcome, please let me know if the above steps work out for you. I look forward to your reply!