How do I fix emoji keyboard not working on my iPhone 15?

Are you sure you are not using a Sticker? If you do not want Stickers to show in your emoji keyboard, you can turn off that option. Stickers are actually small images, not like an emoji that you use inline in Text Messages.

Send stickers in Messages on iPhone - Apple Support

Neenock wrote:

Pls Put it back!!

This platform is designed as a user-to-user forum with Apple Inc. acting as a moderator. The primary objective is to foster a community where users can participate in meaningful discussions while adhering to established guidelines.

This platform serves as a space for users to engage in meaningful conversations, share information, and exchange ideas related to Apple products. It's a community-driven initiative where users support each other by sharing their experiences and technical expertise in using Apple devices. While Apple Inc. is not actively participating in these discussions, the forum is a valuable resource for seeking guidance and assistance from fellow users who possess a wealth of experience with Apple products. Feel free to explore the discussions, ask questions, and benefit from the collective knowledge of this community.

Please note that this is a public forum, so when attaching a screenshot, please avoid including any personal credentials such as IP addresses, card details, email IDs, Apple IDs, IMEI numbers, serial numbers, phone numbers, order IDs, invoices, or any identifiable location information if you are sharing a map.