The process can take 15 minutes to 30 minutes for the Avatar to appear in the “Other” row of the VRChat menu. There are only 3 slots within the VRChat "Other" section for avatars; therefore, users can only load 3 avatars at a time from the Tafi Avatar Creator.
In addition, users should be signed into their own Tafi Avatar Creator account, VRChat account(s), and Steam account in order for the avatar upload to be completed and for the avatar to appear. Meaning, users are not able to upload a Tafi Creator Avatar into another user's VRChat account. This is the reason why the accounts are merged together.
Submit a ticket if all the above is accurate and your avatar is still not appearing.